The two monster hunters and their angel, the time traveling alien and his companions, and the consulting detective and his blogger. They all soon become pieces of a game designed by Gabriel the Trickster. They must survive their perilous journey, play by the rules. They must win the game.

John is possessed. Castiel is injured. Doctor, please help.

London's darkest hour is upon us as citizens start dropping dead, their bodies torn to shreds. The demons are planning something big, and using the lives of innocents to accomplish it. Bolder now than ever before, the demons wield a weapon capable of destroying the world as we know it, and come equipped to exploit that power maliciously and without mercy. Outnumbered and overwhelmed, the Doctor and his companions embark on their biggest adventure yet, and with the Winchester's at their side, nothing can stop them. Not to mention the help of the greatest detective the world has ever known. What they don't know is that this is much bigger than a few deaths here and there; the one behind it all has something much more frightening in mind, and will stop at nothing to get what he craves. Will this unlikely fellowship be able to find and defeat him in time? Or is it already too late...