I'm glad you asked because 'Falling Angel' holds a reputation for a twist that completely reframes the story. Initially, the novel presents itself as a straightforward noir mystery: a cynical 1950s private investigator, Harry Angel, is hired to track down a missing crooner named Johnny Favorite. The investigation is bizarre, involving occult circles and strange characters, but it feels like a classic detective yarn. You follow Harry's gritty, first-person perspective as he pieces together clues, getting deeper into a world of séances and voodoo.
Then the final pages arrive. After confronting the enigmatic Louis Cyphre, the truth is revealed through recovered memories and a birthmark. Harry Angel isn't looking for Johnny Favorite; he is Johnny Favorite. He made a Faustian pact for fame, used dark magic to steal another man's identity and erase his own memory, and has been hunting himself the whole time. Louis Cyphre is literally Lucifer, come to collect his due. It’s a masterstroke that makes you reread the entire book, seeing every moment of confusion and denial in a new, horrifying light. The detective was the mystery all along.