Originally Posted by NightBird
A combination noir/horror: Falling Angel by William Hjortsberg. The movie, Angel Heart with Mickey Rourke and Robert DeNiro, was based on this book. There is a huge, jaw-dropping twist near the end.
Good book and movie. I saw it when it first came out on video and guessed the "twist" about halfway through the movie but nobody believed me.
I haven't read any Frederick Forsyth since the 80s but his books usually have a twist at the end.