When Sherlock and John are thrust into a strange case involving corpses with missing hearts they find they have been thrown into world they never knew existed. They find themselves in the United States working alongside two headstrong brothers, a crazy Scottish man, and a young London school teacher as they fight an evil that may very well kill them all...and destroy the world.

Set in between 5x04 -5x08 and the beginning of City of Ashes. As Sam, Dean, and Castiel struggle to stop the end of days, Clary and the shadowhunters are at a loss to defeat Valentine. After a chance encounter in NYC team free will and the nephilim are forced to work together to save the world. Various pairings and warnings inside.