Pick up The Sicilian my freind. You shall not be dissapointed. Expect Michael Corleone to be in it but not as the lead role. It is based on Salvatore Giuliano (spelt Guiliano in the novel*), a bandit in Sicily during Michaels exile there after the killing of McCluskey and Sollozzo in Louis Restaurant in the Bronx.

* Salvatore Giuliano was a real life bandit in Sicily in the 40's but Puzo felt it was better to change the spelling so the story doesn't turn into a complete true biography. This way he could change things with his own artistic writers license. Although most of the story does follow the true life of Giuliano.