Who killed the Invincible Man?

A man with the gift of immortality lives centuries of heroic deeds before becoming a depressed drug addict in the present day. Doubting that he has lost his powers and frightened by the idea of becoming an ordinary mortal, he is determined to publish an autobiographical bestseller with the help of a successful now-retired writer and a new surrogate family. The ghosts of the past, however, will not be long in coming knocking at the door for one last unfortunate adventure….