Author's Note: Hey there, beautiful human beings! I hope that everyone is doing well. Here is the crossover I talked about. Castiel and Elizabeth are best friends! And for a while, Sherlock and John probably won't know about Elizabeth's secret life as a hunter. Prepare yourself for some Supernatural characters entering the world of Sherlock. This is going to be fun!

So setting... You see, lovely readers, I will not be following the plots of each individual Supernatural episode to the letter. I will just follow the general plotlines of the entire season. Honestly, it will probably be a lot less confusing that way. I will try to keep all the fics general though, thus with few spoilers.

Also, this will be completely separate from my other Supernatural fics. There will be no Kat.

Also, this is completely separate from my other Sherlock fics.

Without further ado...

Elizabeth pulled her coat closer around her. Darn these London winters! It felt like it was below zero and the biting wind certainly was not helping.

Just four more blocks, Elizabeth reminded herself. She was walking back to Baker Street from Bart's, where she and Molly had been hanging out.

Suddenly a man in a tan trench coat came stumbling out of an alley. Having experience with many classes of criminal, drunkard, and victim, Elizabeth quickly stepped forward to see if she could help.

"Are you alright, sir?" Elizabeth asked the man.

"I have to get back," he mumbled. He had an American accent.

Drunk tourist, maybe? "Sir, do you need any help? Can I call a cab for you?"

"I'm fine," his voice was a little stronger now. "I just have to wait for the sigil's energy to dissapate."

"Okay," Elizabeth rolled with it. "What's your name, sir?"

"I'm Castiel," he answered. "I am an Angel of the Lord."

Yep, really drunk tourist. "That's great," Elizabeth said calmly. "Can I call someone for you, Castiel?"

"No, no," Castiel looked around. "Sam and Dean are waiting for me."

"Where are they?"

"The bunker," Castiel replied almost absentmindedly. "Probably."

"And where's the bunker?" Elizabeth really just wanted to get this guy out of the cold.

"Lebanon, Kansas."

"America?" Elizabeth asked.

"Of course," Castiel said it like it was obvious. "Where am I? Is this New York City?"

"Uh, no," Elizabeth raised her eyebrows. "You're in London. London, England."

"Oh," Castiel shrugged. "I was banished very far this time." He looked up to the sky. "Ah, the energy has gone away. I'll be going now."

"Wait!" Elizabeth wasn't going to let Castiel out of her sight until he was somewhere safe. She reached out and grasped his shoulder.

It was the weirdest sensation. Her hand felt like it had been glued to Castiel's shoulder, and he was pulling her through a vacuum. Elizabeth thought she was being compressed and stretched at the same time. What was going on?

Just when she thought she might be sick, it stopped. Blinking away the haze, Elizabeth realized that she wasn't in London anymore.

Not taking her hand off of Castiel's shoulder, she looked around frantically. They were in some sort of huge room. There were stairs along one wall that led to a landing and what looked like a door. A large, long table sat in the middle of the room, papers and books scattered across it.

Sitting at the table were two men. They both stood up when they noticed Castiel and Elizabeth.

"Cas," the shorter of the two men, who was still quite tall, approached them. "Are you alright? You were gone for hours."

Castiel nodded, "It took longer to escape from the Void than usual. My Grace is failing, Dean. After I escaped the Void, I was transported to London, England."

"Cas, who's that?" the taller man stepped up beside Dean. Oh, so these guys were Sam and Dean.

Castiel seemed to just have realized that Elizabeth was still clutching his shoulder in a death grip. "Oh, this is Elizabeth Angelica Holmes."

Elizabeth managed to form words, "I never told you my name!"

"I am an Angel of the Lord," Castiel explained.

"Yeah, so you said," Elizabeth was starting to believe him. "What was that? How are we...not...in London anymore?"

"It's like teleportation," Dean answered before Castiel could.

"Wait," Sam looked at Elizabeth. "Cas, did you take her from London?"

"Not intentionally," Castiel gestured to Elizabeth's unmoving hand.

Elizabeth slowly pried her fingers off of the angel, "Sorry."

"Take her back, Cas," Sam's eyes widened. "You can't just kidnap a teenage British girl and hope nobody will notice."

"I can't."

"What?!" Sam, Dean, and Elizabeth all exclaimed together.

"My Grace is drained," Castiel explained solemnly. "I cannot take her back until it has healed."

"How long is that going to take?" Elizabeth asked. Sam and Dean glanced at Castiel as well. Elizabeth figured they probably weren't jazzed at the idea of her hanging around too long.

"Three days at the most," Castiel replied.

"What?!" They cried again.

"No offense, Isabelle," Dean said. "But, uh, we don't really have the time to be babysitting at the moment."

"Okay, first," Elizabeth retorted. "The name's Elizabeth. And second, I am perfectly capable of calling a cab, going to the airport, and getting home on my own."

"We're not going to let you go to the airport alone," Sam said gently.

"Well, tough," Elizabeth argued. "Because I am not waiting around for three days for Castiel to get his Grace back. I do not want to explain this to my father, and if I leave now, I can just say that I went to Dartmoor."

"You don't understand, kid," Dean pressed. "There's a lot worse out there than a couple of hunters and an angel."

"I know that," Elizabeth snapped. "I don't scare easy. Just let me leave, and I'll be fine."

"You can't leave alone, Elizabeth," Dean shook his head. "Look, there's this thing called the Apocalypse happening and there are demons everywhere. They are after us, and they would kill you just because you were here."

"Dean, I could take her," Sam inserted, putting a hand on Dean's arm. "They're not after me. They'd let me go."

Elizabeth didn't even bother trying to make sense of that second point. She was going home.

"Sam, no," Dean argued. "It's too dangerous. She can wait the three days until Cas can zap her back."

"If you keep me here, you will have the wrath of the British Government raining down on you," Elizabeth warned. "My uncle probably already knows I'm gone, and it's just a matter of time before he finds this place."

"Yeah, we'll see about that," Dean countered. "Any signal your cell phone gave off was jammed the second you came in here. No signal can get out of this place unless we say so."

"Dean-" Sam tried again.

"No, Sam," Dean shut him down instantly.

Elizabeth deduced the two men quickly. Brothers, obviously. Sam was younger by three to five years, Dean had practically raised his little brother. Father most likely dead. Mother definitely dead. Rough, hard lifestyle and job. Used to living in simple conditions. Eyes having seen horrors beyond their years.

Elizabeth softened. Obviously, these guys weren't really trying to inconvenience her, They were telling the truth. Who was she to disagree anyways? She'd only been privy to this new world for like twenty minutes.

"So..." Elizabeth began. "Three days, did you say?"