When Claire told Sara that her brother was here, she gave her a "bugger off, I'm busy" look that she had perfected since hanging around Crowley. But Claire insisted, and Sara followed her downstairs.

The second she looked at him she knew Claire was telling the truth.

Their eyes were the exact same, but somehow their similarities didn't end there. Though they had different mothers, it was obvious they were related. They were the same height, and little things matched together – freckles, fingers, small things.

Gavin's eyes widened a bit. "Who are you?"

"I'm Sara," she said, looking him up and down. "Who are you?"

"Gavin. You – why do you look like me?"

"You look like me."

"No way, I'm older."

"Barely! You're, what, twenty-six?"

"Technically."

"What the hell does that mean?"

"Are you my sister?"

"I don't know."

"Are you Crowley's daughter?"

"Yes."

"I'm his son."

Claire watched this exchange with her arms crossed, leaning against the wall. They spoke easily to one another, similar to the way Crowley and Sara exchanged words.

"I didn't know I had a brother," Sara said after a moment. "So . . . you're half demon, too?"

"No," Gavin said. "Let's sit down. There's a lot to discuss here."

Sara had heard a lot of things in the past few months, but Gavin's took the cake. Abducted from the 1700's by an angry she-demon to use as leverage over the King of Hell? That was almost as crazy as Sara's life herself.

"So you just stayed here?" Claire frowned.

"Not exactly," Gavin admitted. "Da told me if I went back there, I'd die captaining a ship headed to America. So instead of going back, I stayed here. I moved to New York and spent a while adjusting. Then I found out more about the supernatural world and decided to investigate. I wanted to find my father, to learn more, but I couldn't find him. Ran into quite a few people and things – good and bad – and from there, I supposed I became a bit of a rogue."

"Or a hunter," Claire suggested.

"I suppose," he said begrudgingly. "I'd prefer if you didn't mention that around father, though." He looked at Sara. "But you . . . you're from here?"

"I'm from Leeds," she said.

"You know what I mean."

"I know."

"Then why are you being like that?"

"Because I'm testing you."

"Testing me for what?"

"Just testing you." She hesitated. "I only found out about . . . all this around three months ago."

"How does it make you feel?" he frowned.

"I don't know yet," Sara sighed. She frowned. "Not that I'm not happy to find out I have a long lost time traveling brother, but why are you here? And what the hell happened to Claire's face?"

Claire and Gavin looked at each other.

"I'll explain," Gavin said. "After Claire does."

"Me?!" she squeaked.

"Who was that guy who attacked you?" Gavin demanded. "I was watching you – I found Singer Salvage Yard in an old hunting journal I found, so I checked it out. I saw the two of you meeting – you talked like you know him. Like you're close."

"Claire?" Sara frowned.

Claire looked away. "His name is – was – Castiel," she began.

Sara gasped. "Castiel attacked you?!"

"No," Dean said, entering the room. He had calmed himself down a bit, but his eyes were still flashing with anger. "Not Cas. Sara, there's something we have to tell you."

Sara hesitated. "Okay."

"Castiel did something," Sam said as he joined his brother, sitting across from them. "Something . . . not great, to save us. All of us, from the Darkness."

"He let Lucifer take him as a vessel," Dean said.

Sara blinked. "Lucifer?" she demanded with a laugh. "You're joking. Lucifer . . . Satan? You're telling me Satan is not only real, but is using Castiel as a vessel?"

"I told you I was his vessel before," Sam pointed out.

"You two were naming off the amounts of times you'd died! I couldn't take you seriously!" She looked panicked. "Why would Lucifer attack Claire? What does he want?"

Sam took a deep breath, unsure of how to proceed.

"You," Dean finally said. "Lucifer wants you."

"Me?" Sara blinked. "I . . . I don't understand."

"Crowley told you about how powerful you are as a Cambion," Sam began gently. "It's a bit more than that. Half demons are so rare because they're one of the most powerful beings ever created."

"I can't even knock an empty can off the fence!"

"Just because you can't control it doesn't mean you don't got it," Dean said. "Lucifer will do anything to get his hands on your kind of power. He's looking for the Hands of God – and Sam here thinks he could use you to find them."

"She can't even find her shoes in the morning," Claire snorted.

"Claire's right," Sara said. "I'm not special. I'm a kid. I don't . . ." she swallowed. "Is Lucifer in Hell?"

"We think so, yeah."

"So he has my Dad?"

Sam and Dean looked at each other, hesitating.

Sara closed her eyes, taking a deep breath. "What do I do?"

"Nothing," Dean said firmly. "You're all on house arrest. Now, Lucifer didn't get enough from Claire to find the exact location but that doesn't mean he won't have demons crawling all over the place. Sam and I are going to ward this whole property. You guys are not, under any circumstances, to leave. Do you understand?"

The girls looked at each other, hesitating.

"This is serious," Sam tried gently. "Claire, Dean and I will do what we can to save Cas – and Crowley, too, Sara," he added, and Dean nodded reluctantly.

"I should go with you two," Gavin said, looking at Sam and Dean. "I can help."

"We need someone here," Dean said. "If you could keep an eye on the place, Gavin . . . well, we need you for this."

"I know we don't have any right to ask you," Sam said. "But this is a pretty serious threat."

Gavin sighed. "Alright," he said reluctantly. "But if you hear anything about my – our – father . . ."

"We'll let you know," Sam promised.

"Hey, guys." Alex popped her head in the door. "I've got something."

Claire, Sam, Dean, and Sara followed her to her room while Gavin went to speak with Jody. Alex had security footage pulled up on her desktop, was running some type of language analysis on her laptop, and was speaking into a headset as she typed away on a tablet.

"Yes," she was saying. "I got the information. Yes. Thank you, officer, the FBI appreciates your help." She hung up, turning around.

"Alex, this is an amazing set up," Sam said, admiring the tech.

She smiled briefly. "Thanks. So, I remembered Crowley mentioning something about some things a few weeks ago when helping us with our history homework –"

"Crowley helped you with your homework?" Dean asked incredulously.

"Uh-huh. Anyway, I got curious so I did some research and found a few of the locations of what is said to be supernatural 'hot spots'. Well, some of them are located in cemeteries, churches, stuff like that – so some have security footage." She hit play on the security footage and they all went silent.

Two men were talking in a church – by their stance, it was confrontational. A priest was attempting to calm another man down, and Dean frowned, wondering where this was going.

Suddenly, the man's mouth unhinged, rows and rows of razor teeth suddenly visible as he ripped off the priests head – blood splashed across the security camera and that was it.

Claire shuddered.

"Levithans," Dean muttered.

"Dean, look at the date on the footage," Sam frowned and pointed. "This is from today."

Alex nodded. "That's how I found it. The FBI is trying to keep it quiet."

"They couldn't all have been hunted down," Dean suggested. "A rouge?"

"Maybe, but I doubt it's that simple," Sam said. "Great work, Alex. This will really come in handy."

"Alright, let's check it out," Dean said, sighing.