It's been brought to my attention that the time this is set is a bit vague. For Grimm, it's late season 3, before Nick lost his powers. And for Supernatural it's mid season 9; Cas is living on borrowed grace and Dean isn't too far down the road but he's held the First Blade.

"You were right, their IDs were fake. How the hell did no one notice?" Hank sighed, walking over to Nick and Monroe who had just walked into the precinct. They had left Trubel at the trailer but whether she was trying to continue their research, sleeping, or eating they did not know.

"What have you got?" Nick asked, hoping Hank had more success than himself, Monroe, and Trubel had. Even after almost twenty four hours, they still had not even an inkling as to what had killed Sophia or what Nick had seen. But despite this, Nick had this feeling that they were connected somehow. Hank lead them over to the desk where he had information on the two 'FBI Agents' up on the computer screen.

"Sam and Dean Winchester. Sam's an ex law student, left after his girlfriend died in a fire in their apartment. Dean's supposedly deceased... at least twice. Mother, Mary Winchester, died in a house fire thirty years ago. Father, John Winchester, died in hospital eight years ago. Both brothers have a record of pretty much everything from credit card fraud to serial murder. These guys are serious criminals"

"Well then why were they at a crime scene pretending to be FBI Agents?"

"Beats me. I've sent out an APB so hopefully we'll get something soon. You guys know what we're dealing with yet?"

"Not a clue. We think there's definitely a connection between Sophia's death and what I saw, but we're beginning to think that what I saw was something that hasn't been discovered yet. Or at least, no one has ever written about it"

"Well, that's reassuring" Hank sighed sarcastically.

"It seems like our best lead at the moment is these two Winchester guys. Hold on a minute, 'Winchester'... where have I heard that before?"

"Did you work a case on one of them once?"

"No, I've heard the name recently" then Nick's eyes widened in realisation.

"Nick? What is it?"

"They're connected, they definitely are. Whatever kind of Wesen I saw, spoke on the phone to at least two people and from what I could pick up their names were Sam and Dean. When he hung up I was too distracted and confused at the time, but now I remember. He muttered something that sounded a lot like the name 'Winchester'."

Monroe and Hank stared at Nick for a while, completely dumbfound that he had managed to piece all those things together. Apparently, today was a day of radical realisations.

"But why would a demon want to kill their host? I mean, isn't the point of possessing a living thing to... possess a living thing?" Sam sighed over the phone. He desperately needed to stand up and stretch but the combination of the phone in his hand, the laptop on his legs, and the moutains of books scattered around him were preventing him from doing so.

"Yeah well, who knows what demons like to do these days. Hey, is Cas there?" Dean questioned down the phone from where he was standing outside the local library.

"Yeah, he got here about an hour ago" Sam looked up to see the angel in question standing outside and lowered his voice slightly "He's still kind of shaken up after what happened. Do you think you-"

"I'm gonna go down to the bar"

"To work or drink?" Sam allowed the frustration to creep into his voice, hoping Dean would notice it.

"I haven't decided yet"

And with that Dean hung up. Sam rolled his eyes in annoyance. Ever since Dean had first held The First Blade he hadn't been quite the same. It wasn't like Sam expected him to be exactly the same as before, after everything he had been through. But even after Cas had hidden the blade where no one could find it and Dean had tried to keep everything as normal as possible, he still wasn't quite Dean. That bothered Sam, a lot. And not many things bothered Sam all that much anymore. Finally, with his cell phone out of his hand, he could push some of the books to the side and stand up. Just as he did so, Cas walked back inside.

"Anything from Dean?" Cas asked.

"No history of seriously violent deaths in decades so we're pretty sure this is just some low-life demon trying to kick up a fuss. Hey Cas, are you alright?"

"Considering my current circumstance, I'm fine, " the angel said shortly before walking back outside. Sam sighed and pinched the bridge of his nose; a sulking angel was just what he needed.

"Nick?"

"Yeah?" the Grimm span around on his heels to face his partner. They were both still at the precinct but Monroe had gone over to the spice shop for a while.

"I think we've got something" Hank walked up to their desks and opened up a tab on his computer. Nick looked over his shoulder to see that the screen showed a map.

"CCTV spotted Dean Winchester walking out of the library just around the corner. We think he's headed for 'The Sunrise' motel block. With any luck, that's where Sam will be too"

Without another word, the two detectives grabbed their coats and left for the motel block.