Michael is a secondary character in Puzo's novel The Sicilian, which takes place during his first exile in Sicily. He learns from Clemenza about the legendary exploits of the novel's main character, Salvatore Guiliano (based on Salvatore Giuliano, but Puzo changed his name), and is eager to meet him, but Guiliano is murdered before the meeting can take place.
Read more about this topic: Michael Corleone