ed s says
The Godfather is by far his best. If you just want a quick entertaining book you should read The Last Don. But if you want something that will make you think read The Dark Arena, The Sicilian or Fools Die. The Fortunate Pilgram is good too, but much different than anything else he did. Stay away from Omerta or The Fourth K. I don't think he wrote Omerta, I think someone tried to write it from notes he left before he died. What did you think of The Family? I liked it, especially since the characters and some elements of the story are true.