There are hundreds of detective stories here on Amazon, this is one of the strangest. In Nightfall you follow Jack Nightingale, a smart private investigator that somehow managed to have his soul sold to the devil. Without giving away much, I have to say that Nightfall is a unique story with plenty of action and some nice twists. Its only real downfall is the fact that the story is a little slow at the start. While I normally just try to read ahead, the book doesn't give you a chance since the slow part is an important part of the character building process. However don't worry too much about it, the book picks up and finishes strong. Definitely recommended.