This is book number 30 in the Commissario Guido Brunetti Mystery series.
As Brunetti and his colleague, Claudia Griffoni, investigate the incident, they discover that one of the young men works for a man rumored to be involved in more sinister nighttime activities in the Laguna. To get to the bottom of what proves to be a gut-wrenching case, Brunetti needs to enlist the help of both the Carabinieri and the Guardia di Costiera. Determining how much trust he and Griffoni can put in these unfamiliar colleagues adds to the difficulty of solving a peculiarly horrible crime whose perpetrators are technologically brilliant and ruthlessly organized.
Donna Leon's Transient Desires is as powerful as any novel she has written, testing Brunetti to his limits and forcing him to listen very carefully for the truth.