Nonna Maria and the Case of the Lost Treasure is the third book in the cozy mystery series by Lorenzo Carcaterra. In this latest installment, Nonna Maria helps a young lady whose grandfather left her a “treasure map” on his deathbed and tries to keep her friend and local carabinieri Captain Murino from getting assassinated by an organized crime syndicate.

When former mob hitman Il Presidente spots a man in his old line of work on Ischia, he makes sure the man knows that if he does anything to hurt Nonna Maria or the people she cares about, there will be trouble. But Captain Murino of the local carabinieri crossed an organized syndicate when he worked in Naples, and they are out for revenge. While Nonna Maria calls on her friends to help Murino, she is also approached by the granddaughter of an old friend trying to understand a treasure map he left her. Nonna Maria reaches out to her old friend the Pirate and a mysterious figure known as The Magician to help her navigate the beach caves around Ischia to find the treasure.

Like the other books in the Nonna Maria series, this is a low-stress mystery where a widow beloved by her island is able to help her friends using her connections and calling in favors. I loved the details about the Castello Aragonese, its torture museum, and the Cemetery of Dead Nuns, which were deliciously gruesome. I always look forward to the Nonna Maria books because I know I’ll get some sleuthing on a beautiful Italian island.