Scene opens up at night at a lake. A group of high school kids are parked at the shore, listening to music and doing typical dumb high school things.

Ballwin, Missouri.

A young man, very drunk, walks to the water's edge with his girlfriend in tow.

"Landon, I don't think this is a good idea."

"You seriously don't believe in that nonsense do you?" He slurred, taking off his shirt.

"I don't think you should be going out there when you're so drunk. Come back to the campfire."

"Janey, don't be such a baby! Come on!"

She hesitated then took a step back. "No."

"Fine, whatever." he jumped into the water swimming away from her. Janey watched him from the shoreline, hoping that he wouldn't go too far out.

Close up to Landon shows him treading water. He sees something floating above the surface and it peaks his interest. The closer he gets, he realizes it's another person. He yells to get their attention. The figure turns and it is a beautiful woman with long flowing hair. She smiles at him.

"I'm sorry, I didn't think anyone else was out here," she said.

"Nah, you're good. You live nearby?"

"Yes." She looks over to Janey who is still standing on the shore. "Is that your girlfriend?"

"Oh, uh, Janey... No," Landon lied.

Back at the shore, Janey notices that Landon has stopped. She walks around the shoreline, trying to get a closer look.

Meanwhile, the girl in the water smiles at him and swims closer. Landon chuckles nervously, but doesn't swim away. The girl wis breathtakingly beautiful. Her face now close to his, she leans in and whispers.

"You shouldn't have lied to me,"

Starled, Landon backs up, but something catches on his arms and legs, pulling him underneath the water. He flails and tries to fight against the force taking him down, but it is too strong. His screams quickly become muddled with incoming water.

"Landon!" Janey screamed, coming in closer. The commotion caused the other high schoolers to look in their direction. Janey ran into the water trying to reach Landon.

The girl in the water calmly watches as Landon sinks to the bottom of the lake. She looks up and sees Janey coming towards her. She dips her head into the water, disappearing from view.

"Landon!" she yelled again. The other kids were now also in the water, looking for his body. One was on shore, calling 911. Janey swam around frantically. Something nudged her foot and she pulled back to see what it was.

Landon's body slowly rose to the surface, a dead look of horror still stuck on his clammy face.

Cut to intro

(Scene Change) Mallory is in a gas station, mid afternoon, walking the aisles. She spots a pack a red vines and picks them up. She has a cell phone in one hand and she dials a number and holds it to her ear.

"Hello?" Dean answered. He is back at the bunker, shooting pool.

"Hey, Dean. It's Mallory."

"Hey, you got a phone! Welcome to the 21st century."

"Haha," she laughed sarcastically. Now at the back of the convenience store, she caught a glimpse of the cute cashier and made an approving face.

"What are you up to?" Dean asked on the other end. "Been working on anything?"

"I'd like to say I have.... but ever since Washington, I've been driving across the country, enjoying American food again. Did you know they have a ten pound burger challenge at a diner in Durango? Man, I love this country."

Dean laughed, "Yeah, you're talking about Ronda's. Great place. Where are you now?"

"Right next to the Kansas border." She stuck the red vines in her pocket and walked out. The attractive cashier looked up as she left. He looked back down at the counter and was surprised to see a crisp hundred dollar bill sitting there. Written along the top was, "Keep the change". Looking confused but happy, he slipped it into his pocket.

Now outside, Mallory put the Red vines in a bag on her motorcycle, still talking to Dean.

"You're pretty close to me and Sam. If you need a place to crash, you're welcome to stay with us."

"You sure?"

"Yeah, we're actually looking into a case right now. I think It'd be right up your alley."

"Okay, that works for me."

"Sweet. I'll text you the address."

"Text? What's a text?"

"Seriously Mal?"

"I've never used a phone before! I'm surprised I haven't broken it yet."

Dean sighed audibly over the phone. "Just wait a sec, it'll come."

"Wha- Ooh." She pulled her phone away from her face. "Oh, look at that.... Alright, I got it. See you later tonight."

"Yep."

She hung up the phone and slipped it into her pocket.

(Scene Change) Dean put the phone back in his pocket. Sam walked up behind him.

"Who was that?"

"Mallory," he said, not looking up from the pool table. "She's coming to help out on the case."

"Wait, she's coming here?" Sam asked, looking defensive.

"Uh...yeah," Dean answered, in a matter- of- fact tone. "Is that okay with your royal stuffiness?"

"Dean, you know how I feel about the situation. Inviting her into the bunker seems like a really stupid idea."

Dean finally stopped his game and looked at Sam. "Dude, if we do this, we can test out your theory that she isn't a human. There are spells and wards for all kinds of things here. If she isn't human, then she won't get very far. Would ya trust me?"

Sam didn't look completely sold. "I'm still not crazy about the idea. What if all the protection we put up doesn't affect her?"

"Well we're going to have to figure it out one way or another. This way, you can eliminate some things off the list in one fail swoop."

"...Fine."

(Scene Change) Mallory finishes packing things in her pack and starts to put on her helmet. Her bike is sitting next to a cluster of other motorcycles parked beside her. Two older, bigger bikers walk over to their bikes. They stopped when they saw her.

"What's a pretty girl like you riding a bike like that?" One chuckled. "Wind's gonna mess your hair up."

She stopped in the middle of putting her helmet on to better talk to the them. "What's a fat guy like you riding a bike like that? People are gonna think you're an idiot," she said, gesturing to his own bike.

"Whaa-" The man said, looking over in the direction of his motorcycle. Where his motorcycle once was, a red plastic tricycle was now in its place. Mallory slipped her helmet over her head and saluted to the men and took off, leaving them in a confused, angry stupor.

(Scene Change) Mallory pulls up next to the bunker and gets off her bike. It is late in the evening. Meanwhile, Sam is touching up a devil's trap underneath a rug by the garage door. Dean walks up to him.

"You done? She should be here any minute."

"Yeah... everything's ready... for angels, demons, witches, you name it."

"Man, I hope you're wrong about this...." Dean said smugly. "Mostly because I'd love to see the look on your face."

Sam shot him a look which Dean didn't catch because his phone started ringing.

"Hey, you here?--- Yeah, let me open the garage for you."

(Scene Change) Sam waits as Dean meets Mallory outside. She walks in behind Dean, stepping onto the rug.

"Hey, Sam!" She said cheerfully.

"Hey," he responded rather awkwardly.

"Nice Bat Cave you guys got here."

"Thanks... You hungry?" he asks, watching her warily. "I can whip something up real fast."

"Sure." she smiled. Dean gave Sam a crooked grin then turned to Mallory. "I can show you to the dining room. Give you some details about the case." They walked away from Sam, Mallory following him.

Sam, now frustrated and slightly disappointed, walked to the kitchen.

(Scene Change) Mallory, Dean and Sam are sitting at the table. Mallory is eating and Sam has his laptop out.

"So this story popped up the other day- Local teen, Landon Burke, drowns in a lake- didn't seem like a big deal, until we looked at the details," Sam explained.

"What details?" Mallory asked.

"Well his girlfriend, uhh Janey Thompson, was watching him from the shore, she saw him drown. Her and at least three others say that they saw someone drowning him . Janey says that when she went out in the water, the figure dipped under the water and disappeared."

"hmm.... have you guys ever dealt with something like this before?"

"Well," Dean said, "We deal with the ghost of a boy once who was drowning people. But we looked into other options: mermaid, siren. That sort of thing. You ever come across something like this?"

"Maybe.." she pulled out her leather notebook and flipped through it. "I've never come across a siren... mermaids are super annoying, but rare and pretty much harmless.... no wait, those are nymphs... scratch that; mermaids will mess you up."

Sam peered at the notes and drawings scrawled in her book. "Did you draw everything in there?" He couldn't help but be impressed and notice how thick the notebook seemed.

"I did... but only the things I've seen first hand. I don't have anything in here that I haven't faced personally... here we go."

She turned the notebook so the boys could see what was on the page. written on the top was, Rusalka, Russian lore.

"What is this?" Dean asked.

"They're very similar to mermaids and the lore of sirens, though they don't have tails; they lure in unsuspecting men with their beauty, then lead them to their deaths. Never heard of one being this far west; they're deeply entrenched in Russian folklore. I killed one outside of St. Petersburg awhile back. There's a good chance this is a Rusalka, but we'll have to dig a little deeper to really know for sure."

"Well, you've already got us beat in the mermaid and rusalka department, glad to have you one the case," Dean said. "What else can you tell us about them?"

"They're pretty much angry spirits. Women who died from a jilted love affair in or near a body of water, either by suicide or were killed by their lover. They drown other two-timing men."

"Angry spirits wiping out random cheaters. Sounds familiar. How do you kill one?" Sam questioned.

"I don't know if there's more than one way to do it, but in my experience, their death must be avenged."

"Wait, so you killed a Rusalka's lover?"

"Of course not Samuel," Mallory said in a half serious, half mocking tone. "Guilt got the best of him... and she did the job herself. If there is another way to get rid of them, we're gonna have to dig a little deeper."

Dean stood up from the table. "Well that's a head start. We'll head to Missouri first thing tomorrow- see what else we can get. We should let you get to bed," he said to Mallory. "You're probably exhausted from driving all day. There's an open room, down the hall, first one on the left."

She stood up, gathering her notebook. "Thanks again, guys," She picked up her plate and started for the kitchen.

"No problem," Sam smiled. He grabbed the plate from her. "I got it." She thanked him then turned and went down the hall, shutting the bedroom door behind her.

Dean turned to Sam, following him into the kitchen. "Well, are you satisfied? She passed all your tests."

"Just because she did, doesn't mean that there isn't something off about her."

"Doesn't mean that there is something off about her."

"Why can't you just trust my hunch on this?"

"Because I want us to be able to trust someone! Aren't you sick of always looking behind your back, trying to guess who's on our side, and who isn't? She just seems like a break from that. She's a good hunter; she's smart. She's on top of things... I trust her," Dean said with resolution.

"How can you be so casual about this? There's a stranger in our home and you treat it as if it's nothing."

"... Well I guess you can say 'I told you so' when you find me dead tomorrow."

"Dean..."

"Don't make me bet on this, Sammy," he said walking out of the room.

"Dean, you suck at gambling."

Dean waved his hand at him and walked out.

(Scene Change) In the middle of the night, Sam is creeping down the hallway towards Mallory's room. A light is shining underneath the door. Sam stops at the door, hesitant on what to do next. He hears a faint noise on the other side. He waits, but curiosity gets the better of him and he opens the door slowly. Mallory is sitting on the floor by the bed, head in her hands. She looks up when he opens the door.

"Hey, Sam."

"Hey.. can't sleep?" He asked, now feeling like an idiot for noticing her tear streaked face.

"I tried... Sleep and I don't really get along though. Sorry if the light was keeping you up."

"No! No, you're fine. I was already awake. You good?"

"Yeah, I'm fine."

"...You wanna talk about it?"

She laughed. "Are you always this awkward when trying to comfort girls?"

Sam laughed nervously. "I guess it's not my strong suit." He stood in the doorway, unsure of what to do.

"It's okay. Just a bad dream. You can go to bed," she said reassuringly.

He nodded, but stayed a bit longer. "I'm sorry."

"For what?"

"For..." he thought, "For whatever you've gone through. I doubt you've had an easy life as a hunter."

Mallory smiled slightly. "I could say the same about you and Dean.... Funny enough, I think life was harder before I became a hunter. But thanks though."

Sam smiled. "Goodnight, Mallory."

"Goodnight."

(Quick Flash) The three are sitting in a living room, interviewing Janey Thompson.

"Janey," Sam started. "What can you tell me about your relationship with Landon? How long had you two been dating?"

The young girl had tears in her eyes. "About two years. But we were off and on a lot."

"Was it a good relationship? Did you trust him?" Mallory interjected.

"Do you mean, do I think he cheated on me?" She was quiet for a moment. "I suspected something going on between him and Alexa Carnes," She said bitterly. Then her eyes got big. "Wait, you don't think I killed him, do you?"

"Of course not!" Sam comforted. " We just want to know more about Landon." He turned the conversation. "Did you see anything strange that night?"

"Well, we were all a little buzzed..." She commented sheepishly. "But I saw someone out there with him. And I wasn't the only one! I'm not crazy."

"Do you know of anyone else who was killed in that lake?"

Janey's face paled. "There's been this rumor around for years that a woman was killed in that lake by her husband... Maybe ten years ago.... Some people say her ghost still hangs around the lake. Since she was killed, a few other people have drowned."

"They blame the drownings on this ghost?" Dean asked her.

"I guess. No one really swims in there anymore...."

Mallory asked her one last question. "Do you know the name of the woman who was killed ten years ago?"

"Rachel Stinson. Her husband was Richard. These days, most people call the lake, Stinson Lake... after her."

"... What a way to keep a memory," Mallory mumbled under her breath.

Dean chuckled nervously and turned to Janey, "Whatever happened to her husband?"

"After he killed her, he shot himself."

The three shared a look of disappointment. "Well, Thank you for your time, Janey. We're very sorry for your loss," Sam got up and nodded at her.

(Scene Change) The gang is now getting back into the impala.

"Well this is just fan-freaking-tastic. If the husband is dead, that doesn't give us a lot to go off of," Dean said, getting into the driver's seat.

"Not necessarily," Mallory explained. "If she killed herself, then avenging her death wouldn't matter..."

"Then how would we kill her? Like we would any ghost?" Sam inquired.

"... That'd be kinda hard if her body was at the bottom of the lake."

"So now what?"

Dean revved the engine. "We find out if she really was killed by her husband."

(Scene Change) The boys and Mallory pull up to a different house, it is closer to sunset by this time. They walk up to the door and knock. A tall man who what looks to be in his late twenties answers the door.

"Hello? How can I help you?" He asked timidly.

"Derek Stinson?" Sam flashed his badge. "I'm Special Agent Spencer, this is Special Agent Guster, " he said indicating Dean. "... and... forensic specialist, Agent O'Hara. We have a couple questions regarding your late parents."

(Scene Change) They are now inside of Derek's house, standing in the foyer.

"I don't understand, my parents were killed over ten years ago. Why would the police be interested in them again?"

"Because as you know, the records state that it was never proven that your father killed your mother; it was only speculated. We're opening the case again," Dean said in a no nonsense tone.

"Okay..."

Mallory piped up. "This was the house that you grew up in? Have you removed anything that belong to your parents? Records, journals, anything to that extent?"

"Yeah, um, I kept everything of my dad's in his study. I moved my mom's stuff in there a couple years back. You're free to take a look."

(Scene Change) They are now in the study going through mountains of papers and notebooks. Dean is looking through an old journal of Richards. He stops towards the end of the journal when something catches his eye.

"Hey, hey look at this. Looks like Dick was worried about Rachel cheating on him."

"What?" Sam and Mallory say in surprised unison.

"Yeah, it doesn't say with who though. He seemed pretty upset about the whole thing. You guys find anything?"

"Not yet." Mallory answered.

They continued to search through their possessions. Some time had passed and Mallory was looking at old photographs from the box that belong to Rachel. Her finger caught the edge of a back of a picture frame and she turned it over and found a small key wedged into the frame, distorting it.

"Lookie, lookie," She said quietly. The brothers stopped and looked at the key.

"Does it open anything in here?" Sam asked.

"No. We've checked everything in this room three times over...Derek" She said to the young man who was in the next room. He wandered in nervously. "What room was your mom's stuff in?"

"Uhh.... The room I use now. Why?"

Mallory gave him a quizzical look. "Just curious. Thanks."

Derek nodded and left the room slowly. Once he left, Mallory turned to Sam. "You go distract him, Dean and I will go take a look in his room."

"Wait, why me?" Sam said in protest. "Why don't you do it?"

"Because, he's been drifting in and out of this room for the past hour and I don't think it was because of mine and Dean's winning personalities."

Sam let slip a faint derp face and didn't move. Dean smiled giddily to himself.

"Now's not the time to be self conscious, Sam. You're a handsome enough dude," Mallory encouraged with a grin. Dean and Mallory slipped past Sam, Dean whispered as he passed him, "Told ya that haircut was gonna come back and bite you in the ass." Sam made a sour face and went to find Derek.

(Scene Change) Mallory and Dean open the door to Derek's room. The walls are covered with various anime posters.

"No wonder Derek was nervous about telling us where her stuff was. This guy's a nerd."

They searched through Derek's belongings thoroughly, checking the bathroom and closet for anything that the key would fit into.

"Okay," Mallory stopped in the middle of the room, thinking aloud. "If I was having an affair, where would I keep all my gushy love crap? Not just out in the open in a locked box..."

"Well, there's no pictures on the wall, couldn't be behind on of those. Maybe behind some of the posters." Dean started carefully removing the posters, trying to find a lump in the wall. Mallory checked the closet again, running her fingers along the floor and walls.

"Find anything?" She asked a few minutes later.

"Nada."

Mallory sat in the closet, staring blankly at the floor. The wood paneling in one of the corners was slightly lifted, so she pulled out a knife and moved over to it. She pried the panel, causing it to pop up. She chuckled darkly to herself and stuck her hand into the hole that the panel hid.

"Dean,"

He came over and she showed him a small box. Using the key, they opened it to find a stack of letters and pictures. They looked through them. The pictures consisted of her and another man. The letters were addressed to a Mark Stephen.

"This guy lives in town," Dean commented.

"Makes our job easier. Let's hope he's still alive."