Determined to kill Lucifer and finally possessing a powerful enough weapon to do so, the Winchesters and Castiel set out to find him. They seek the help of a powerful psychic, Darcy Summers. Only problem? She has no idea she's psychic. Darcy will have to find a way to work with a very confusing, yet intriguing angel in order to save the world and stop the Devil. Cas/OC.