i've also read The Fourth K, and agree its a fantastic book to read and recommend it to everyone. even out of his genre, it truely reflects Puzo's ability to keep the reader on the "edge of their seats".
i too would like to see a film made, and agree that Brando would be perfect for the role of the Oracle, especially now with his new build!! (hope i dont offend anyone with that last remark!!)
Whilst reading the book i always imagined the Oracle as Brando, although more in the form of Don Corleone!!