Falling Angel is a 1978 horror novel by William Hjortsberg. Written in a "hardboiled" detective style with supernatural themes, it was adapted into the 1987 film Angel Heart.
In 1959, a popular crooner before and during the Second World War, entertainer "Johnny Favorite," hasn't been seen or heard since he was critically wounded during a 1943 Luftwaffe raid on Allied forces in Tunisia. When private investigator Harry Angel is hired to locate him on behalf of a mysterious client who calls himself Louis Cyphre, he finds himself enmeshed in a disturbing occult milieu.
The book was adapted into a 1987 North American/British mystery-thriller film entitled Angel Heart, starring Mickey Rourke, Robert De Niro, and Lisa Bonet.