Nonna Maria has lived on Ischia, an island in the Gulf of Naples, her entire life. Recognizable by the widow's black she's worn every day for decades, she always has pasta on the stove and espresso in the pot for the neighbors who stop by to ask her advice on life and love. Everyone knows her, and she knows everyone's business. So if something goes wrong, islanders look to her, not the local carabinieri, to find the solution.

When a recently engaged woman confesses that she's afraid her fianc�, a stranger to Ischia with a murky past, might not be who he seems, Nonna Maria helps her disappear so she can investigate the true nature of her betrothed. The stranger has also raised the suspicions of Captain Murino of the carabinieri, but he's occupied investigating the death of a tour boat captain who drowned in the wee hours of the morning. Captain Murino believes it was an accident, but Nonna Maria knows the man was a born sailor and too good a swimmer to drown, no matter how much wine he might have drunk. While Captain Murino has his hands full, she pours herself a glass of white wine and gets to work, even though getting involved will expose her to the dangers lurking just beneath the surface of her idyllic home.