A Mexican village sits high atop a mesa in the desert. Stiles and Lydia are walking cautiously through the town discussing "the stupidest plan we've ever come up with" and fearing that someone will get killed.

They approach a doorway but their entry is blocked by two men. Stiles shows a large card with a stylized skull on the front and the two teens are allowed to enter. They walk down a darkened hallway ending in front of two large wooden doors. They again discuss the foolishness of the plan but press ahead, opening the doors on a packed dance club. The music is loud, the lights are flashing and dozens of people are dancing.

Stiles and Lydia are spotted by Severo Calavera who alerts someone by walkie-talkie. When the kids approach the bar, they are served two shots – Lydia says they didn't come to drink and drops a brass bullet casing stamped with the stylized skull image into the shot glass.

~~~

Araya Calavera is using a small, curved blade as a seam ripper, intently working a piece of cloth as Stiles and Lydia sit quietly on the other side of the table from her. She comments on how Severo hates the music playing in the club but she loves the music of youth primarily due to its "savage energy."

Lydia is all business, saying they know Araya has Derek and offering cash for his return. Stiles lays out $50,000 on the table. Araya knows the money is from the stash taken from Silverfinger and says as much.

Severo and two other hunters cock their weapons. Araya says Stiles was not smart to come alone to which he says "what makes you think we came alone?"

~~~

In the club, Malia is dancing and Kira is sitting along the side of the dance floor. Both glow their eyes in their significant colours.

~~~

Araya is insulted, "You brought a wolf into my home?" Stiles says they brought an Alpha.

~~~

Scott is in a darkened corner of the dance floor – red-eyed and ready.

~~~

Hunters with walkie-talkies are searching the dance floor. Kira senses something is wrong and approaches the dancing Malia. Malia says they should blend in and tells Kira to dance with her. Kira is awkward and after a few seconds, Malia grabs the small of her back and pulls her closer. The pair grinds on the dance floor attracting the attention of the other patrons and drawing a small crowd in around them.

~~~

Araya says the gang has poor timing and then pontificates about "the dark moon". Lydia explains that it's the part of the lunar phase when the moon is least visible in the sky. Araya wonders if they know what it means. Lydia says it's a time of reflection or grief. Araya seizes on the latter and says she wonders why, when Scott and the rest have suffered so much loss, they would risk it again for someone like Derek. Stiles says it because they don't like to lose.

One of the hunters calls on the radio – they are checking in from various points in the club. The front door is clear as is the south section but there is no answer from the hunter stationed at the north end. Scott picks up the unconscious hunter's walkie-talkie and says "Stiles, take 10 off the table."

Stiles removes a stack of cash and Lydia suggests Araya should just take the deal. Araya says she's keen to follow the warning of a Banshee but declines the offer.

~~~

Two armed hunters have spotted Malia and Kira. The girls spot them too and prepare to fight. Kira takes out "glow stick nunchaku" and they turn to defend themselves. They easily best the humans while Scott takes out another armed man. The three then go in search of Stiles and Lydia.

~~~

Stiles cracks jokes about how Araya doesn't want to keep a "downer" like Derek, saying he has "no sense of humour" and is a "poor conversationalist." Araya is not amused she grabs the radio and tells Severo to "show them how the Calaveras negotiate."

~~~

Severo, in the DJ booth above the dance floor, nods to DJ who takes out a bullhorn that sprays smoke when triggered. Smoke also issues from several points around the club.

~~~

In the hallway, Scott sees smoke begin to rise from under a door – then it pours out of all the vents near the ceiling. He recognizes it as Wolfsbane and tells Kira to run. She tries but a hunter is waiting and coldcocks her with the butt of a shotgun. Araya comes out to gloat saying "someone who's been an Alpha for only a few months should be more careful when facing a hunter of more than 40 years." Scott realizes that Araya doesn't know where Derek is either. He says as much and she shocks him with a cattle prod.

~ Flashback ~

Stiles, Scott and Lydia are at the Animal Clinic. Stiles questions Scott about how long it's been since he's heard from Derek. Scott says "weeks" passed without a word so he went by the loft and found it locked with the alarm set but inside he found lots of brass bullet casings with the skull symbol which Deaton has identified as the mark belonging to the Calaveras, a family of hunters in Mexico. Stiles wonders if they killed Derek and Scott says that's what he's hoping Lydia can determine.

He passes the container of shell casings to her she reaches in and grabs a handful, working them back and forth in her fingers. She drops them to the floor and each one strikes with the sound of a gunshot and Derek's scream. She says Derek isn't dead but she's not sure he's alive either. She says she doesn't know what it means but that there is something not right. They decide to search for the Calaveras in Mexico.

~ End Flashback ~

Scott comes to on the floor of a filthy public restroom. Kira is hovering over him.

"He's awake! Guys, he's awake!" Kira yells. Stiles and Malia quickly join her, helping Scott to his feet.

"Scott, you okay?" Stiles asks."Yeah... They don't have him. They don't have Derek" Scott replies"We know... But right now, they've got Lydia" Kira answers."Lydia? What do they want with Lydia?"

~~~

Araya is pouring tea at a table on the sidewalk in front of a cafe called "Consuelas." It is the next day and the hunter explains that she doesn't have much experience with Banshees. Lydia says she doesn't either since she's only recently become aware that she was one. Araya then sets Lydia a task to determine which of two men standing guard nearby are going to die.

~~~

Scott tries to pry open the large metal door.

"It's not going to work," A weak voice says and they all turn their attention to the girl sitting in the corner.

"Who are you?" Stiles asks.

"No one special, my name is Diana" the girl replies.

"You're the one that saved Derek and Peter" Scott realises.

"I had help but yeah. And you guys can relax, they're not gonna kill your friend"

"How do you know?" Stiles asks.

"'Cause if they wanted her dead, she would already be dead"

~~~

At their table, Araya peels an orange with a wicked serrated blade. She continues to question Lydia about her power wondering if she has to touch them or something they own to tell who is going to die. Lydia says she doesn't know. Araya fingers the knife as she wonders how close to death the person has to be. She taps the knife and Lydia begins to get a feeling as she looks at the two men. Araya suddenly whips the knife out at one of the men, striking him in the chest. Lydia lets out a little scream as he drops to the ground. She asks Araya why and the old hunter says "he stole from me." Lydia asks what she wants and Araya says she wants to know what kind of Alpha Scott really is.

~~~

Severo and two other hunters enter and shock Scott with the cattle prod.

~~~

Araya and Lydia return to find Scott bound to a chair with manacles, chains, and electric wiring. Scott begs the hunters to let Lydia and the others go as Lydia is being chained to another chair in a similar manner.

Severo brings Kira in and explains that since "the fox" is not susceptible to the electric current, she will be forced to work the machine that shocks Scott. If she refuses Severo will shock Lydia. When she refuses, he points out that Scott can heal while Lydia will not.

Araya explains, calling Scott "Lobito" or "baby wolf," that it is a test and if Scott answers then nobody gets hurt, if he doesn't answer "we turn on the dial." She says they don't know where Derek is and wants to find him as well and keeps insisting that Scott knows. He keeps saying he doesn't even as Kira is forced to increase the electric charge.

~~~

Back in their restroom prison, Stiles is pacing.

"Can you stop?" Diana asks.

"You know that's easy for you to say. It aren't your friends up there. You aren't even in real danger" Stiles replies.

"I'm a hunter that went against them. I'm in more danger than you guys"

~~~

Scott continues to say he doesn't know anything as the current is steadily increased by a reluctant Kira. Araya pushes Kira aside and cranks up the juice to the maximum. Eventually, with Araya's leading questions about the Hales, Scott realizes that the only person that she could be talking about is Kate Argent.

With a burst of strength, he breaks the manacles and is free and Araya demands he say the name, which he does.

~~~~

"That's impossible. It's impossible! That can't be what he said" Stiles says after getting Malia to listen in on the Calavera's conversation with their friends."Why? Who-who's Kate?" Malia asks."She's a Hunter... An Argent. Killed by Peter Hale while he was still an Alpha. He ripped out her throat and it turned her into a supernatural creature. The Calavera's have been tryng to find her ever since" Diana explains."Why didn't you tell Derek and Peter that?" Stiles asks.

"Because I didn't know it yet"

"What is she?"

"Dangerous"

~~~

In a dark, cobwebby stone hallway we see Kate standing in front of a disc-shaped sculpture inlaid in the stone wall. Behind the sculpture, Derek Hale appears to be unconscious, tied and covered in cobwebs.

~~~

Araya lets Scott and his friends go explaining that she knows where Kate is hold up but the four men she sent to find her did not return. Before letting him go, Araya says she knows what kind of Alpha he is and where his "next step lies." She says "when you take the bite of an innocent, when you make a wolf of your own, when you do that – I will cross your border and come knocking at your door."

"So, what now?" Stiles asks.

"She thinks she knows where we can find Derek" Scott replies.

"She's gonna tell us where?" Malia asks.

"Uh, actually, she's giving us a guide" Scott answers and at that moment two motorcycles arrive.

"And who are you two?" Stiles asks the girls stepping off of the motors.

"Braeden. This is Liz" Breaden answers.

" And right now, we're the only ones who are gonna take you to La Iglesia" Liz adds.

"The Church?" Lydia asks sceptically.

"What's 'The Church?'" Stiles asks.

"It's not a place you'll find God" Liz replies.

~~~

"Okay, I'll ask... Who's Kate Argent?" Malia asks.

"Uh, I'd like to know, too..." Kira admits.

"Well, we were at her funeral, so I'd like to know how she got out of a casket that was buried six feet underground" Stiles replies.

"She was never in it" Scott explains. A silence falls over them and Lydia sighs.

"She was Allison's aunt... and a total sociopath" Lydia explains.

"You don't have to talk about it now if you don't want to..." Kira says knowing that anything to do with Allison is still a sensitive subject for all of them.

"Um, yes, he does!" Malia comments.

"Yeah, she's right. You guys should know. You need to know." Scott says.

"All right... Kate was the one who set the fire that killed most of Derek's family" Stiles starts explaining.

"Some of them survived, like Cora and Peter..." Scott says.

"A very angry Peter" Lydia points out.

"Yeah, he's the one who bit and turned me"

"And the one who finally caught up to Kate and killed her"

"And we saw her buried" Stiles points out to his friend.

"No... We saw a casket, remember? She wasn't in it. The Calaveras heard that Kate had been killed by an Alpha's claws. They wanted to make sure she was really dead. Her body was healing, more and more, as she got closer to the full moon. She was coming back. So, they switched the bodies. If a Hunter is bitten, they have to take their own life before they change. The Calaveras... they treat the Code like law. They make it their responsibility to enforce it" Scott explains

"Good for her! I wouldn't do it, either" Malia admits.

"Would you kill a half-dozen people to get out? Because that's what she did" Scott counters.

"So, Kate's a Werewolf now?" Kira asks.

"I don't know. You know, there's a saying... 'Sometimes, the shape you take reflects the person you are.'" Scott answers

"What kind of shape is sociopathic bitch?" Lydia asks. Then the Jeep hits something.

~~~

"What happened?" Liz asks

"I don't know-- it felt like we hit something" Stiles answers

"Scott, we need to get there by night. It's too dangerous, otherwise." Breaden points out.

"Go" Stiles says.

"Not without you!" Scott counters.

"Dude, someone needs to find Derek. We'll figure something out. We always do. Just go"

"Okay."

"Scott... I can't think of anything else to say, except for "Be careful." And... and I know "Be careful" sounds kind of lame, and I'm totally sure the second you're gone, I'm gonna think of something much better, but I-" Kira starts to ramble.

"Uh, "Be careful" works for me" Scott cuts her off and they hug.

"Scott, the sun's going down..." Breaden says, rolling her eyes at the two.

"Hey, I gotta go," Scott says and lets go off Kira. Liz throws him her helmet and he nods at her. He gets on the motor and they leave.

"Stiles...?" Malia draws everyone's attention. She pulls a bony claw out of the tire and hands it to Stiles. "I don't think we hit something-- I think something hit us"

~~~

Braeden and Scott arrive at La Iglesia. There is a collection of ruined buildings with a damaged Spanish style church at the center. Braeden says an earthquake leveled the town but not the church and the locals believe it's because the church was built on top of a Aztec temple which was once home to the Nagual which Scott recognizes as a race of shapeshifters. Braeden says they were werejaguars.

~~~~

"Maybe we should just walk..." Lydia suggests.

"Hey, I will never abandon this Jeep! You understand me? Ever. Ever. Ever" Stiles replies.

"Not to mention that whatever got into the tire didn't just appear in it" Liz points out and opens the hood of the car. She looks at all the duct tape and then gives Stiles a questioning look.

"Work faster, Stiles... Liz is right, and I think it's still here" Malia orders.

~~~

As they walk into the ruined church, Scott catches Derek's scent and something else "not human."

~~~

"Lydia, could you please hold the light still for a second? It's really hard to see anything if you keep shaking it like that" Stiles says annoyed

"I'm shaking it this way because we're in the middle of nowhere with your broken down Jeep, and we're being attacked by yet another razor-clawed monster, and I'm terrified!" Lydia replies.

"Well, just be slightly less terrified... And hold this.." Stiles says and hands Lydia a part of the car.

"What's this?"

"I don't know-- I'm hoping it's not important"

"Okay, stop. Give me the wrench" Liz says pushing Stiles aside. She glows her eyes and starts to fix the car. Kira grabs her sword and joins Malia at the front of the Jeep.

"Anything?" Kira asks."It's too hard to see. We should've brought another flashlight" Malia replies. Kira uses the sword to reflect light at some nearby rocks and something moves there. "Did you see that?" Malia confirms seeing that by roaring and running after it.

"Malia, wait!" Kira yells, going after her."Hey, Malia!" Stiles yells and tries to run after her too."Kira, go! You-- fix the Jeep. Stiles, focus!" Lydia orders.

Kira and Malia meet up in the dark and both sense that they are chasing something "big and fast" and cuts deep. Malia has been injured. They hear the Jeep start-up and run back.

~~~

As they descend beneath the church, Braeden asks why Scott didn't kiss "his girlfriend" and he explains that Kira isn't his girlfriend. She asks if Scott would regret not kissing her if they die and adds "you should have kissed your girlfriend."

They see skeletons moving in the dark but they are just a collection of bones with no real form. Scott senses something but neither of them can see where it is because it moves too fast.

~~~

"You.... You, please don't do that ever again!" Stiles tells Malia when they're all sitting in the Jeep again."Do what?" Malia asks."I... I thought you just took off. I thought you were running"

"I wouldn't leave without you""Really?""I would never leave without you. ...Them, I would leave.""Yeah... Uh, it's progress...." "That doesn't look good" Liz comments on the wound in Malia's side."It's okay" Malia replies."Are you sure: It looks deep" Kira agrees with Liz."I can feel it healing" Malia assures them."You didn't see anything?" Lydia changes the subject."Barely... It had a strong scent, though." Malia answers."Like what?" Stiles asks."Like death." Malia explains grimly.

~~~

Scott growls into the cave causing a small cave-in and "scaring" their pursuer away. The roar-induced rock fall also reveals the carved circular sculpture which Braeden recognizes as an image of which she describes as the "Nagual jaguar god." Scott punches through the rock surface and there is someone inside who reaches out to them.

~~~

"So... Liz... You're a werewolf?" Stiles asks.

"No" She replies not looking up from her nails.

"But you're eyes-" Lydia states confused.

"I know, a lot of people think I'm a werewolf because of them but I'm not" Liz explains still not looking up from her nails.

"Okay, then what are you?" Stiles asks.

"I'm a witch" She replies while making a flame appear in her hand. "But I don't have much control over my abilities yet, so I barely use them" She makes the flames dissappear and the Jeep comes to a stop in front of the church.

Stiles and the others step out of the Jeep as Scott and Braeden exit the church with the person they found inside. Stiles and Lydia look shocked as the figure is revealed to be the spitting image of a young Derek.

"Is that him? Is that Derek?" Malia asks.

"Uh... Sort of..." Stiles replies.