A helicopter, spotlight shining, circles above Beacon Hills Hospital. On the roof, Stilinski along with and several other officers are cataloguing the crime scene. Sean's corpse lies where it fell after the Mute killed it.

Sheriff Stilinski has Parrish clear the roof and seal the scene so that he can consult with an "expert" about the scene. Parrish is surprised that the sheriff has "an expert on teenage cannibals" but does as he is ordered.

Derek Hale seems to appear out of nowhere once the officers leave. The Sheriff explains what Scott told him about Sean being a Wendigo. Derek describes them as "cannibalistic shapeshifters" and says they've not been in Beacon Hills for a long time. He suggests Sean's family was well hidden.

Derek then catches the scent of blood. Scott claimed it was just Sean, the assassin and himself on the roof – but Derek says there was a fourth person, a young male.

~~~

Stiles, Liz and Scott arrive back at the McCall House.

"Like I said, I told my dad everything I could--" Stiles says

"But you didn't tell him about Liam?" Scott cuts his friend off

"You barely told us about Liam! What did you do with him, anyway?" Stiles asks and Liz seems to be in shock of Scott's stupidity.

"He's upstairs..."

"Doing what?"

"...Lying down..." Liz narrows her eyes at Scott and runs up the stairs. She runs into Scott's bathroom and sees Liam laying in the bathtub, wrapped in duct tape. Stiles and Scott also walk into the bathroom and Liz sighs.

"You guys are idiots" Liam – mouth covered by tape – grunts and whimpers at Scott and Stiles from the tub. Scott and Stiles go back to Scott's room and Liz kneels down in front of Liam. "This is gonna hurt, if you scream or whatever I'm putting it back up. Understand?" Liz asks and Liam nods. Liz rips the tape off and Liam yelps but then quickly shuts up.

"Why do you always hang out with people who're asses to me?" Liam asks her.

"'Cause my taste in friends is almost as bad as Selene's" Liz sighs. Scott and Stiles come back into the room and pick up Liam. They move Liam from the tub to a chair in Scott's room.

"Okay, Liam... Now, you've seen a lot of confusing things tonight. And more confusing things are going to happen because of the confusing things that happened tonight. Do you understand?" Stiles explains and Liz frowns. She's standing in a corner of the room.

"Not really..." Liam replies.

"Good. That's good" Stiles says sarcastically.

"I don't understand, either..." Scott says.

"Maybe you should tell him" Stiles proposes.

"Tell me what?" Liam demands.

"Liam... What happened to you... what I did to you... which I had to do to save you? It's going to change you..." Scott says.

"Unless it kills you" Liz points out.

"What?!" Liam exclaims.

"Uh... Uh-oh. Oh-oh... Is he... Is he crying?" Stiles asks.

"Liam, it's okay. You're going to be all right. You're not going to die" Scott tries to reassure him.

"Probably not.." Liz adds.

"Are you kidding me? We just got relieved from Isaac's pessimism, now we got you" Stiles states and Liz snorts.

"You haven't even met Selene's boyfriend yet"

"Okay. One, does everyone just know Selene? And two, I'm pretty sure Isaac Lahey is her boyfriend"

"Well, one, yes and two... technically. But like literally everyone at our school ships her with someone and I mean if you saw those to together, you would too"

"Would you two please just help me untie him?" Scott interrupts them. They untie Liam. "Liam, are you okay? "

"We're sorry about that. We're really sorry--" Stiles starts but gets cut off by Liam, who after a moment jumps up, grabs the chair and whacks Scott with it. Scott falls into Stiles who stays on his feet. "Liam, what the hell is your-" but he once again gets cut off by Liam, who punches him in the face. "Get him!"

He makes it to the end of the hall before Scott and Stiles come after him. They all end up rolling down the stairs and end up in a cluster at the bottom. Liam escapes and Scott points out that Stiles' plan sucked too. They both hear Liz dying of laughter upstairs.

~~~

The alarm light is flashing at Derek's Loft but the alarm is not sounding when Peter shuts it off and calls out for his nephew. He is focused on reading a document when a tomahawk flies through the air and lodges in his chest.

The Mute steps out and Peter gasps for Derek. His attacker types on his wrist keyboard and an electronic voice says – "Don't worry Peter. Derek is next."

~~~

Stiles is attaching chains and restraints to Malia in his bedroom. Malia says she hates full moons. Stiles promises it will get easier. The restraints are worn through in some areas and she believes they may not last much longer. He says they should try to make this the last full moon that they will need to use it. He also says they may need them for Liam.

Malia questions if they know for sure that Liam will turn into a werewolf and Stiles again says he's not sure he'll live. The sheriff stops by his son's room, sees the chains, and decides he doesn't even want to know what's going on and turns around to leave.

~~~

Lydia has her math notes on her laptop. Kira says it doesn't look like math. Lydia agrees that it looks more like code and she has no memory of writing it. She points out that, since her drawing a tree led to the Nemeton she should probably figure out what the code means "before it tries to kill us."

Kira says it might be like the Enigma Code the Allies used in World War II. She reminds Lydia that her father studied the war and her mom "was in it".

Lydia believes it is a variation of the Vigenère cipher which is a code in which letters are substituted based on a code word or "key."

Lydia's Mom, who sometimes teaches at Beacon Hills High School, dangles a set of keys in front of Lydia reminding her that she can have no more than six people at the lake house, to stay out of the wine and that if anything gets broken it will be added to Lydia's credit card debt. Mrs. Martin also reminds her to lock up the basement because from all the scratches on the walls it looked like a pack of wild animals had gotten down there.

~~~

Garrett, Violet, and Mason exit the school bus. Garrett is complaining that he doesn't want to watch another movie on a "Friday night." Mason reminds him that they are freshmen and just got off a school bus so won't be "hitting the clubs till 4AM."

Liam arrives, out of breath, with a bloodied bandage covering his arm. Mason asks him why he wasn't on the bus and he says he ran from home which is apparently 3 miles away. Liam has a dizzy spell and sees Scott watching him from across the quad. He then rushes inside the school.

Inside, Stiles and Scott corner him and convince him to listen. Scott tries to explain the situation but doesn't know what to say. He tries a couple of lines that Derek said to him after he was bitten saying "we're brothers now" and "the bite is a gift" and that something big is happening to him.

Liam is not impressed. He says nothing is happening to him and rips off the bandage and Scott's bite has healed completely. He leaves them standing there.

~~~

Sometime later at school, Liz, Lydia, Scott, Kira, Stiles, and Malia are discussing what to do with Liam.

"I'm not sharing my basement" Malia says.

"Actually, it's my basement, and my mom noticed how you tore it up last time" Lydia corrects her.

"All right, she's still learning" Stiles points out.

"But we're going to use the boathouse for Liam. It's got support beams-- we can chain him to one of them" Scott proposes.

"But how do we get him out to the lake house if he doesn't trust us?" Kira asks.

"I say, if it keeps him from murdering someone, we chloroform the little bastard and throw him in the lake" Stiles proposes.

"I'm in" Malia agrees.

"You guys are idiots" Liz says.

"You got any better ideas?"

"Literally every idea is better as chloroform, considering it takes about 5 minutes to induce anaesthesia with chloroform and that is under conditions with a willing patient (or a patient in restraints), even with a fully soaked rag you're going to have to hold your victim still (implying higher physical strength which begs the question; why not just choke the victim unconscious which takes fifteen seconds maximum, then you can just inject them with 150+ milligrams of ketamine, which would cause unconsciousness in one or two minutes. Plus, you guys are underestimating Liam"

"What do you mean?" Scott asks. Liz takes out her phone from her pocket. She shows them a picture of a wrecked car.

"That's the car of one of our teachers after Liam took a crowbar to it" Liz explains.

"Well that's slightly terrifying" Stiles states.

"Okay, let's be smarter. We tell him there's a party and invite him" Lydia proposes.

"So, you're going to ask out a freshman?" Stiles asks.

"No-- I'm done with teenage boys. But, if we're playing a trick on someone... why not use the trickster?"

"Who, me? No way. Not me" Kira refuses.

"Yes, you! You know what they call a female fox? A vixen!"

"Me?"

"You can do it, Kira. Be a vixen!"

~~~

Liam catches site of Kira coming down the stairs in the hallway. He is smitten. In slow motion, Kira sexily descends the stairs but trips on the last one and falls on her face. Liam rushes to help her and she asks him to go to a party with her.

~~~

Peter has a gaping chest wound, oozing black puss, but is still alive after his encounter with The Mute. At the loft, Derek explains that the ax was coated with Wolfsbane and since he doesn't know the species, he'll have to burn it out.

Peter points out that he can handle a little fire (a reference to the Arson). Derek lights a blow torch and sets to work. Peter screams.

Once he's recovered, Peter explains that The Mute said he was after Derek. Peter apparently stripped him of his key board speaking device during their fight and shows it to his nephew.

~~~

Kira drives Liam through the woods. The full moon is out. Liam's hearing becomes very sensitive and while her car stereo is playing low – he hears a cacophony. Kira explains that they're going to Lydia Martin's lake house but that it actually belongs to Lydia's dead grandmother.

Liam gets a text from Mason "Where are you?"

After Kira explains that "everyone" is coming to the party, Liam responds to the text.

~~~

As they get closer to the lake house, Liam's breathing becomes labored and Kira looks worried. Once they arrive he seems fine but he is suspicious that there aren't more vehicles there. Inside, Liz, Stiles, Scott, Malia and Lydia are waiting. Stiles says to think of it as an intervention.

~~~

Derek has brought the wrist keyboard (which is attached to a leather glove) to the Sheriff's Station. The sheriff is still trying to figure out the Mute. He wonders aloud how he eats with no mouth. Derek wisecracks that Peter didn't get a chance to ask him since he was too busy fighting with a tomahawk in his chest.

That's another question on Stilinski's mind, "who runs around with a tomahawk?" Parrish sticks his head in and says he did in the military for "I. E. D." (Improvised Explosive Device) removal. He says the tomahawk and the wrist keyboard are both military issue. He says the device they have looks to have been modified. At a nod from Derek, the sheriff closes the door between his office and the bullpen and turns back to Parrish and says "show us."

~~~

"Werewolf?" Liam asks, pointing to Scott, who nods. "Werecoyote?" Malia also nods. "Witch?" Liz nods, looking bored. "Banshee?" Lydia nods. "Fox?" He asks.

"Kitsune. But "fox" works" Kira explains.

"What are you?" Liam asks Stiles.

"Uh, for a little while, I was possessed by an evil spirit... It was very evil..." Stiles replies.

"What are you now?"

"Better?" Liam notices the chains and restraints on the coffee table.

"Are those for me?" He asks.

"No, they're for me" Malia replies and glows her eyes.

"How did you do that?"

"You'll learn. But first, you need to get through the full moon" Scott answers.

"The moon's already out" Liam points out.

"And you're starting to feel something, aren't you?" Scott points.

"I feel like I'm surrounded by a bunch of psychotic nutjobs! You guys are out of your freaking minds! I don't know how you did that eye-thing, and I don't care-- I'm walking out the door right now, and if any of you try to stop me, I swear to God, I'm gonna--" He gets angrier and angrier until his hearing is overwhelmed by a noise only he can hear. He is disabled. Scott cocks an ear to listen and a car pulls into the drive.

Liam admits that he told Mason about the party and Mason apparently invited everyone.

Liam's nails shift into claws and he begins to scratch the floor. Lydia freaks out a bit and demands that they get him off the floors. Liam rises up, bares his fangs, and growls at Lydia. Scott and Kira rush him to the boat house.

Malia is suddenly overwhelmed by her transformation and growls at Stiles who rushes her off to the basement. Lydia is left to deal with the unexpected party goers because Stiles points out that she throws the best parties in Beacon Hills.

"Do they always do that? Just leave you to figure it out?" Liz asks.

"Sometimes" Lydia replies. They go to the door and find more than 30 people are lined up to get inside. Mason and Garret are in front and ask if they're in the right place for the party. Lydia forces a grimace-like smile and says "absolutely." The crowd cheers and flood inside.

~~~

Parrish has hacked into The Mute's keyboard glove device and says he's found an IP address. The sheriff points out that they can use the address to find him. The glove twitches and on the screen a message arrives.

The screen reads –

SEC

SBC #38 ; SBUF ADR – 38

INY

STA (ZPGWRK),Y ; IF ADR OF NEXT TAB

PHA ; WHICH GOES INTO

TXA ; LINK

SBC #0

INY

D BENEFACTOR: MONEY TRANSFERED

They're baffled by the "handle" Benefactor but the sheriff realizes that the money means The Mute isn't just a killer, he's an assassin.

~~~

Lydia's lake house sits on a hill above the lake, a small metal boat house sits on the water. Inside, Scott tries to hold a snarling Liam back while Kira fastens the chains to one of the buildings support beams. Liam breaks free and lands on top of Scott who manages to hold him off until Kira smacks him in the head with a nearby boat paddle. Liam is knocked cold.

~~~

Stiles is fastening the restraints to Malia as the music from the party plays in the house above. Malia keeps trying to get Stiles to leave but he refuses.

~~~

Upstairs a delivery man rolls in a keg of beer.

"Okay, I didn't order a keg of beer-- especially not domestic" Lydia says.

"Somebody ordered it. Are you trying to tell me nobody here wants to drink?" The delivery guy replies. Lydia notices a glass of wine on her laptop and freaks

"Who put this here? This laptop is two thousand dollars... Oh, and that bottle of wine is four-hundred... How much?" She asks the delivery guy and he hands her a form. "What's this extra hundred dollars?" She asks.

"I call that the, 'Yes, you do look twenty-one to me'-surcharge"

"Let me get you some cash..." Lydia says as she notices Mason going upstairs. She follows and Garrett says he should pay for the keg since he opened the wine. He hands the delivery man several bills.

~~~

Kira and Scott watch over Liam who is still out cold. Kira says he looks young and Scott points out that he is just 15. Scott says they will help Liam and seems certain that the boy will want their help.

~~~

Malia is still trying to get Stiles to leave her. She begs and threatens (graphically) but he refuses to leave her and says he won't let her hurt anyone. Her restraints begin to tear.

~~~

"Demarco?" Liz asks, stopping in her tracks to look at the delivery guy.

"Lizzie?" He asks and they hug.

"What are you doing here?" she asks with a smile on her face.

"I could ask you the same. I thought you were in Mexico"

"I was"

"What are you doing back?"

"Questioning everything I thought I knew"

"Well, even though I'd love to meet the people that got the famously stubborn Elizabeta Moore to change her mind, I gotta go"

"Did you just make a werewolf pun?"

"Well, you must admit my puns are bewitching"

"Please stop"

"Fine. Have you heard of Selene? Ever since she left for France someone has been worrying sick about her"

"Ah, worrisome mothers. And no. Do you know where Reed and Cher are?"

"Why? Miss your favorite other bitch?"

"And dog joke, perfect, just perfect"

"Well, thanks. And last thing I heard they were in New Orleans, looking for Cheryl's dad"

"Things must've gotten pretty bad if she's gonna talk to that ass"

"I know right? Well, I'll see you Saturday, remember?"

"How can I forget a meeting? Bye" They hug again. Demarco walks out the door and Liz walks up the stairs, having seen Lydia disappear on them. She sees Mason walk into the kitchen but shrugs it off.

~~~

Outside, Demarco returns to his car. He has a flat tire and begins cursing. He grows claws and his eyes glow yellow as he grunts and growls. He takes several deep breaths and begins to chant – "three things cannot be long hidden: the sun, the moon, the truth." He repeats the mantra three times, begins to calm down, and drops to his knees.

As he is kneeling, a figure comes up behind and loops a chain around his neck. It is pulled tight and as Demarco struggles we see his assailant is Violet – Garrett's girlfriend. She pulls the chain tight and then pushes a silver brooch attached to it. The chain begins to glow and Demarco's neck begins to smoke. Within seconds, his head is detached from his body and flops to the ground. Violet snaps a picture with her cellphone and walks away from the body.

~~~

She returns to the house. She has refashioned the deadly wire into a necklace and the brooch/button mechanism hangs bolo-like around her neck. She walks up to Garrett who is pleased to announce that "our friend" just sent him a text.

It is from "the benefactor" and says "The money has been transferred into your account." Violet smiles broadly and they kiss.

Mason is looking around upstairs. He wanders into a white room with red accents at the end of the hall. It is decorated sparsely with a bookcase, a couple of chairs, a desk and a record player.

"Liam? You up here? Dude, where the hell are you?" Mason searches for his friend.

"What are you doing up here? The party is downstairs" Lydia tells Mason, who had walked into the study.

"I was looking for Liam"

"Sorry, but missing freshmen are a little low on my priority list" She picks up two glass, filled with what looks like red wine.

"But not so low that you don't know he's a freshman?" Lydia starts to push Mason out of the room.