Marcus Harper is a FBI agent who is assinged a case that gives him a glimps into a world most know nothing about. The case almost kills him. Due to his actions during the case he is reassigned to the Unkown Division. There he is partnered with a sarcastic agent named Jack Priest. Marcus learns in this division they deal with vampires, werewolves, jinn, shapshifters, angels and demons. He also learns of an old race known as the nephilim. They are half man half angel, and they have a mission. Its on Marcus Harper, Jack Priest, and the Uknown Division to stop the nephilim.