Below was taken from "Bookbrowse.com", on Mario Puzo:

"His bestselling novel The Godfather, (1969) was preceded by two critically acclaimed novels, The Dark Arena (1955) and The Fortunate Pilgrim (1965). In 1978, he published Fools Die, followed by The Sicilian (1984), The Fourth K (1990), and the second installment in his Mafia trilogy, The Last Don (1996), which became an international bestseller and the highest-rated TV miniseries of 1997."

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The blurb was written before "Omerta" (2000) was released. There is also a listing for "The Clericuzio" (1996), but I've never heard anything about that.