Five archangels show up on earth, looking for a human warrior capable of standing up to the original fallen angel himself: Satan. They find Grayson Reed, a laid-back Seattle police officer, and inform him that he has been chosen to do battle against the devil. He thinks they're crazy, but subsequent events convince Reed that Satan is very real, and it's up to him to gird for battle or else watch the world he loves descend into utter chaos.