It all started with Cas. He heard it. He heard whispers of the future. The Prophecy of Seven.

Cas stopped dead in his tracks and listened closely.

"Is there something wrong, Castiel?" Naomi asked behind him.

"There is a new prophecy…" Cas muttured. "There's a new prophecy." He repeated, more sure this time.

"I do not hear anything." Naomi said, looking at him funny. "Are you okay? Are you tired?" She asked even though angels don't really get tired.

"No, I'm-"

"Do not worry, I'll take care of the garrison." Naomi abruptly said, pushing Cas forward.

"Naomi, I'm fine." Cas insisted. "It is just that I am hearing a prophecy. A new prophecy."

Naomi stared at him. Angels memorize every prophecy in existence. It's built into their system. When there is a prophecy, they could hear it as it is being written like an over voice in movies when the character is reading a letter.

"Then I have no business in it." Naomi concluded. "There's a reason for everything and there's a reason why you are the only one who could hear it. Tell me, what is it saying?"

Cas closed his eyes and listened deeply. He could hear it. It sounded like it came from everywhere -from, every angle- even from the inside of his very system.

Seven heroes from different worlds will collide

To kill the life from stone and turn the tide

For they are the key to eternal darkness

But united, the strongest of forces

The children of stone will wake their mother ships

Using the blood of the seven.

Help will come from the wise's lips.

And he will betray them through hell, not heaven.

Naomi blinked when Cas grew quiet.

"That's it?" She asked. "Why is it rhyming? Prophecies are not usually rhyming."

"Then what is it? Who are the seven heroes?" Cas asked.

"I do not know but I have a feeling that this involves the Winchesters." Naomi replied.

"When are they not involved? I will talk to them but what about the garrison?"

"It will be my honor to lead them." Naomi said, smiling.

"You are a friend and I trust you, Naomi." Cas replied before shooting down to the earth and scanned the earth for the Winchesters faster than the speed of light

"Smell that Sammy?" Dean asked promptly as he stepped out of London's International Airport.

"The cold air?" Sam suggested, heaving their bags behind him.

"The cold London air. We're in London, Sammy." Dean smiled widely.

"I hope those hours of flight are friggin' worth it." He muttered.

"Focus, dude. We're only here to finish Bobby's case." Sam said, pulling out a notebook.

"Check this out. 5 people were found dead in random places in London all in one week. No wound, no poison, no nothing."

"There's gotta be something." Dean said, looking at the notebook.

"Well, they were all last seen in the same place." Sam said. "In the alley between 29 and 30 Bartner street. And the people that live there complained that they heard screaming at about 3 a.m. which is why they called the police. The police thought it was nothing until they find a body somewhere in London the very next day."

"So how are we going to find them?" Dean asked.

"One of us should be bait." Sam said, looking pleadingly at Dean.

"what?" Dean shrugged. Sam just stared at him.

"Oh! You want me to be bait!" Dean said "hell no."

"Come on Dean, you're the eldest, you gotta take care of your younger brother!" Sam whined.

"I don't wanna be bait!" Dean cried. "Plus you're, like, 50 times taller than me which makes you harder to drag off."

There were about to play rock, paper, scissors, when a voice from behind them said "I'll volunteer."

The brothers jumped and they turned around to find Cas standing right behind them,

"son of a bitch" Dean said, rubbing his hands on his face. "I nearly died back there. Next time can just please approach us from a distance?"

"Cas, what are you doing here?" Sam asked.

"I'm on-" Cas suddenly stopped in his tracks. He can't tell anyone about the prophecy. Knowing the future is dangerous and he doesn't even know what it means yet. Maybe he should say it when all of the seven heroes (whoever they are) are already gathered or if the others need to know. '…va…cation?" Cas said, more like a question asking if they would buy the lie or not.

"Angels go on vacation?" Dean asked.

"…yes?"

"Alright then" Sam said, tilting his head a little "Let's get going then."

"Yes, we should." Cas replied.

Dean and Sam exchanged glances "he really does need a vacation." Dean muttered as he hailed a cab.

"29 Bartner street, please, thank you." Sam said as the trio piled into the cab.

The cabbie tipped his hat politely and started driving, driving them slowly into the heart of London itself. None of them knew that the biggest adventure of their lives was slowly coming.