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Mario Spezi (born July 30, 1945) is an award-winning Italian journalist and author. He wrote the non-fiction, true crime book, The Monster of Florence with American author Douglas Preston. Additionally, he is credited by Preston for providing details used in the novel Brimstone.
Spezi spent much of his career tracking the case of the notorious serial killer known as the Monster of Florence. He was even jailed on charges of impeding the investigation, though the charges were overturned on appeal.