I have a few of Gann's books. Fate is the Hunter is by far my favourite. I also have A Gentleman of Adventure and Song of the Sirens. All three are books that you cannot put down until you're asleep.
The man was a great writer as well as a great man. I had the pleasure of speaking to him several times before his death and he was a true gem.
I guess I'd better add something here. In a previous post I mentioned Gan, St Ex and Rick Drury as the 3 great aviation writers. If I don't add Robert Serling, He'll take back all my signed copies. Sorry Bob.
The day you stop learning is the day you should die.