A good venetian detective novel is 'The Gondola Maker's Detective'. In this novel, the main character, a detective, has to solve a series of murders that are somehow related to the gondola - making industry in Venice. The book gives a lot of insights into the Venetian culture and traditions as the detective uncovers clues.
One of the well - known venetian detective novels is 'The Anonymous Venetian' which offers a great blend of mystery and the unique Venetian atmosphere. Another is 'Death in Venice' which, while not strictly a pure detective novel in the traditional sense, has elements of mystery and exploration within the Venetian setting.
There's 'Venetian Blood' which is a great example of venetian detective novels. It delves deep into the dark alleys and canals of Venice while the detective tries to solve complex crimes. The descriptions of Venice in the book really add to the overall mood of mystery. It makes you feel like you are walking those ancient streets along with the detective.