In the living room of the Gilbert house, Elena was sitting with the guys. "Okay, first off, how did he get in?" Damon asked.

"He must've been invited in." Elena said.

"Aw, man." Everyone turned to Jeremy. "He disguised himself as the delivery guy last night. Aunt Jenna must've let him in."

"That's a new one, even to me." Damon said. "Did he say what he wanted?"

"He was too busy trying to kill me." Elena told him.

"And we've never seen a case like this before." Stefan said.

"This is going to be a tricky one if he's this smart." Damon said.

"You think he's working with someone?" Jeremy asked.

"I don't know."

"Wait, Jer, he's been invited in." Elena realized. As soon as she said that, she knew he knew too.

"Jenna's in danger."

"Then we better take him out before he has a chance to get to her." Damon said.

"Are you sure about this?" Stefan asked.

"What's the plan, then?" Elena asked.

"We go to the dance and see if he shows up."

"That's your idea?" Stefan asked him.

"Until he's gone, Jenna's still in danger." Damon pointed out.

"There's no way he can take down all four of us." Elena said. "Let's do this."

The group showed up at the dance a few minutes later. Elena found Bonnie and Caroline. "Hey."

"I was wondering when you'd show up." Caroline said.

"Having fun?"

"No, but this took about two hours, so I'm staying at least half of that." Caroline told her.

"What's Damon doing here?" Bonnie asked.

"Coming here was actually his idea." Elena told her. She whispered something to Bonnie. She nodded, understanding.

"What is this, like, a threesome now?" Caroline asked. "You and the Salvatore brothers?"

"No, but if I'm going to be with Stefan, then I have to try to tolerate Damon." Elena said. "I mean, it's not like I can kill him or anything."

"It looks like you've got it all figured out." Bonnie said.

"I'm just saying, if you need me to straighten him out…"

"Care!" They both yelled.

"Just saying." Caroline put up her hands in surrender and took a step back.

Jeremy was watching the scene, listening from the punch table. He couldn't help but laugh a little, forgetting Elena could also hear him. "You know, sometimes I feel like other people are listening in on a private conversation." Elena said.

"Sorry." Jeremy focused his attention elsewhere. Elena headed over to the punch table to talk to him. Damon came over to the girls.

"Hi, Bonnie. Wanna dance?"

"No thanks." She said, she turned to leave.

"You're not scared, are you?"

"Leave her alone, Damon." Caroline said. She started to walk off with her, then turned back to him. "She has two left feet and it's a really uncomfortable subject for her." She left. Just then, Elena and Stefan returned.

"Where did they go?" Elena asked. She knew that Bonnie was leading Caroline somewhere else so she wouldn't get hurt.

"I don't know." Damon told her.

"What did you say this time?"

"What makes you think it was always something I…"

"Guys, really?" Elena asked. "This isn't going to work unless you put your arguing aside." The guys were still looking at each other. "Stefan, may I have this dance?" The two of them headed to the dance floor.

"Shouldn't you be able to sense if he's around?" Stefan asked as they danced.

"No, unfortunately, that's not one of our cool superpowers, as you put it." Elena explained. "Even vampires have trouble telling each other apart. All we can do is keep an eye out for him."

"Yeah, unless he's in costume." Stefan pointed out. Elena laughed as he spun her in.

At the punch table, Jeremy was surprised when Anna showed up. "You neglected to mention this was a theme party." She told him.

"What are you doing here?" Jeremy asked.

"Well, since you didn't invite me, I thought I'd take matters into my own hands." Anna told him.

"Are you following me around?" Jeremy asked her.

"What?"

"It's like you think we're dating, and we're not."

"Oh, you mean stalking." Anna said. Jeremy nodded. "Come on, I've never been to a school dance before. Humor me."

Damon was standing near the edge of the gym, when Alaric noticed him. He walked over to him. "Hey, do I know you?" Damon turned to face him. Something about him seemed a little familiar, but he couldn't remember. "Sorry, it's just you looked familiar for a second. How'd you get roped into chaperoning?" Alaric asked. "Alaric Saltzman. I'm the new history teacher."

"I see. The cursed faculty position." They shook hands.

"So I've been told."

"Damon Salvatore."

"Salvatore? As in Stefan?"

"He's my little brother." Damon explained. "I'm his legal guardian, hence the chaperoning."

"I hear he's very bright." Alaric told him.

"He knows a lot about history." Damon said. "He's always throwing himself into his work. It helps him forget family stuff."

"Any parents?"

"It's just us now." Damon told him.

"So, you live here your whole life?"

"Yeah, though we used to go to a different school. Transferred over just this year."

"Do you do a lot of travelling?" Damon looked at him. That was a weird question. "Sorry, I don't mean to pry. It was nice meeting you."

"You, too."

"Enjoy the rest of the dance." Alaric told him before walking off. Damon couldn't help but wonder where he'd seen him before. He came up with nothing.

Anna was helping Jeremy out at the table. "You don't go to school here. You know, you don't have to help."

"I don't mind." Anna told him. "It's kinda fun." She turned to him. "Oh, before I forget, could I borrow you're ancestor's journal?"

"Why?" Jeremy asked. "I mean, it's just an old journal full of folklore and myths. Besides, I can't just give it away. Family history's important, you know?" He noticed something in Anna's eye. "Your eye." Anna turned away quickly.

"There's something in it. I should probably go." She walked off very quickly. Jeremy watched as she left. Was it possible she was a vampire, too?

Back on the dance floor, Elena was still with Stefan. There was still no sign of her attacker. "Maybe he's not gonna show." She said.

"You mean we did all this dancing for nothing?" Stefan asked.

"Ah. The horror." Elena joked..

"I'm really sorry about all this."

"It's my choice, Stefan. I decided to be here. I officially signed on for it, so I don't want to hear you apologizing." She said. As a new song came on, she added, "Besides, if anything, I should apologize to you for dragging you into all this mess in the first place."

"Are you kidding?" Stefan said. "I'd do this anytime if I had to. Even if you were normal." Elena wondered how she even got involved with this, but it didn't matter. She kissed him.

It wasn't until a few minutes later, she noticed someone in the back corner in a hoodie. "Stefan, the back corner."

"Find Damon and Jeremy." Stefan told her. Elena started to head over to Jeremy. Stefan went into the hall to find the guy.

"What did I do?"

"Where is he?" Stefan asked.

"I was getting a soda and this guy gave me his hoodie." Stefan ran back toward the gym.

Elena was still looking around when her phone rang. She answered. "Hello, Elena." She recognized the voice. It was him. "Here's what you're going to do. There's an exit behind you. You have five seconds."

"And if I refuse?" Elena asked.

"Your brother dies." She glanced around and found the guy standing behind Jeremy. "I can snap his neck so fast I bet there's not even a witness. Start walking."

"Leave him alone." Elena growled. Then she lowered her voice. "He's behind you."

Jeremy heard and turned around, but there was no one there. He did see the door behind him swinging back, though, as though someone tried to make a fast exit. Elena ran into the hallway and tried to escape, but the door was locked. She tried using her strength, but even that didn't work.

The vampire was behind her, so she ran. She found herself in the cafeteria. Suddenly, the vampire appeared and threw her back. He was strong to her surprise. She picked up two pencils that were lying on the ground, when he pinned her to the wall. Elena had had enough of his games, now it was her turn. She vamped out and threw him off of her. He looked up, surprised. He went to attack her, but she shoved the pencil into his arm, causing him pain.

She made a mental note to always carry pencils if they attacked at school. She tried to speed out, but he appeared in front of her. Before he could do anything, help had arrived. Jeremy through him off his sister. Elena broke off a wood mop handle and tossed it to Damon. He staked the vampire in the stomach. Stefan appeared by her side and held her as she nearly collapsed.

"You okay?" He whispered.

"Yeah, thanks for the back-up." Elena said.

"Okay, start talking." Damon said. He wouldn't say anything. Jeremy nodded to him. Damon moved to the side so that Jeremy was in front of the vampire.

"You better talk or I'll kill you." Jeremy said.

"Uh. Fine. Whatever." The vampire said weakly.

"Why are you doing this?" Jeremy asked.

"It's fun."

"Oh, right. Threatening my older vampire sister was real fun for us, you dick!"

"Jeremy!" Elena yelled as he pushed the stake in further.

"What do you want with Elena?" Stefan asked. Elena was holding onto him for support. The fight took more out of her than she thought.

"She looks like Katherine."

"What?" The group said in unison. They all looked at each other, equally confused.

"How..." Elena began.

"I didn't know anything about this, did you?" Stefan asked his brother.

"No idea." Damon said.

"Who's Katherine?" Jeremy asked.

"They're ex, long story, I'll explain later." Elena told him.

"Wait, does that mean…" Everyone was completely lost now. Damon regained his composure and turned to the vampire.

"How do you know she looks like Katherine?" He asked.

"You thought you were the only ones who knew her?" The vampire asked. "Besides, who do you think was sent to shut her in?"

"You…"

"Damon, please." Jeremy tried to restrain him. He shook him off.

"I'm fine. I'm good."

"Is there a way to get in without harming anyone in the process?" Jeremy asked.

"No. I won't say." He screamed in pain as Jeremy pulled on the stake again. "Okay, okay. The grimore."

"Where do we find it?" Stefan asked.

"You need the journal. Jonathan Gilbert's." The vampire gasped in pain.

"Who else is working with you?" Elena asked. She knew he wouldn't be this smart to do something this stupid.

"No. You're gonna have to kill me." Jeremy looked at Elena. She nodded and looked away as he finished the job.

"Well, now how do we find the others?" Damon asked.

"We had to kill him." Elena pointed out. "He'd been invited in."

"We'll find them, I know we will." Stefan said. They heard a sound then. They all turned, but whoever it was disappeared.

"I'll check it out." Jeremy said. He went into the hallway and saw no one around. Whoever it was had gotten away.

In the hallway, the guys were talking. "There's no way that idiot was working alone." Damon said.

"So, what did he mean by a grimore?" Stefan asked.

"It's a witch's spell book." Damon explained. "I don't know what else it means. Emily said she lost hers years ago."

"Wait, maybe that's what they need to reverse it." Stefan said. "Emily's grimore. You said yourself, only a powerful witch can open the tomb. Maybe the spell for opening the door's in there."

"Yeah, but now it's us verses how many other vampires out there."

"Okay, all we have to do is find it, get Katherine out, and make sure the vampires in there die." Stefan pointed out.

"Fine. But I still don't like where this is going."

"Wait, that vampire said you looked like Katherine, but there's no way you could be related." Jeremy said as he and Elena headed toward their house. Then a thought occurred to him. "Unless…"

"I know." Elena said. She went inside and found Jenna. "Am I adopted?" She asked.

"What?"

"Don't lie to me, Jenna. I need to know the truth. Am I adopted?"

"Your mother was going to tell you." Jenna told her. "A woman came in one night when your father was working late. She disappeared after you were born. All Miranda wanted was to be a mother. They kept it secret."

"That's a big secret." Elena said.

Later that night, she was upstairs with Stefan. "Are you okay?"

"Yeah, though I'm still in shock over the adoption thing." Elena said. "On the other hand, I'm glad that creep's gone. It was hard fighting him alone."

"I wish you didn't have to fight."

"Hey, I do whatever I have to in order to protect the people I care about." Elena told him.

"Yeah, speaking of which, I told Damon I'd help him get Katherine out of the tomb." Stefan explained. "But I don't know if I can do this alone."

"I'll help you out." Elena told him. "As much as I hate to say this, I think it's the only way to help him."

"Thanks, Lena."