Commissario Brunetti is surprised by the appearance in his office of a friend of his wife's, fearful that her son is using drugs. When Tullio Gasparini, the woman's husband is found unconscious and with a serious head injury at the foot of a bridge in Venice, Brunetti is drawn to pursue a possible connection to the boy's behaviour. And to make matters even worse, a leak has been discovered in the Questura ... The 27th novel in the bestselling series.