Killer Angel is a didactic novella by American author William Frost. Killer Angel is about a group of friends who start a rock band and dream of making it big. The angel, Benjamin, meets up with his old friend, Levi, who has turned on him to become a dark angel. When Levi shows up in some of the band members' dreams, he offers them fame and fortune in exchange for their souls. Choices come into play to decide what's right and wrong. Will they accept Levi's offer for fame and fortune, but no soul? How much is friendship worth?.