according to Wikipedia
The Godfather is a crime novel by American author Mario Puzo. Originally published in 1969 by G. P. Putnam's Sons, the novel details the story of a fictional Mafia family in New York City (and Long Island), headed by Vito Corleone, the Godfather. The novel covers the years 1945 to 1955 and includes the back story of Vito Corleone from early childhood to adulthood.

The first in a series of novels, The Godfather is noteworthy for introducing Italian words like consigliere, caporegime, Cosa Nostra, and omertà to an English-speaking audience. It inspired a 1972 film of the same name. Two film sequels, including new contributions by Puzo himself, were made in 1974 and 1990.

The Corleone family, one of the Five Families of the New York Mafia, fights the other four families in a brutal war in the years after World War II.