Jonathan Smith is an ordinary 18 year old mechanic from London. One night, on his way home from work, he is brutally murdered. His friends and family are shocked by the tragedy. Jonathan arrives in Heaven, where he meets his long dead father, James, who is an angel, and it turns out that Jonathan himself is half angel. James tells Jonathan that he is destined to lead the angels to victory against their enemies, the demons. Meanwhile, in New York, serial killer Cain Bennett is shot and killed in a shoot out with local cops and F.B.I. agents. He arrives in Hell, where he is recruited by Lucifer himself to lead the demon army in an attack on the gates of Heaven.