Roberto Saviano is only 38, but for nearly a dozen years it has been like this: He is guarded around the clock, moving from house to house and sleeping in the police station when he returns to Naples, because it’s the only safe place for him to stay overnight in his home city.

Saviano earned the long line of people who wish him the very worst with his first book, “Gomorrah,” which in 2006 peeled back Naples’s skin to name the mobsters who he says destroyed his city. Thus began his journey to become Italy’s most divisive writer.

He returned to Naples recently to show us key places that appear in his new book, “The Piranhas.”

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