Early one morning Guido Brunetti, Commissario of the Venice Police, confronts a grisly sight when the body of a young man is fished out of a fetid Venetian canal. All the clues point to a violent mugging, but for Brunetti the robbery motive seems altogether too convenient. Then something very incriminating is discovered in the dead man's flat, something which points to the existence of a high level cabal - and Brunetti becomes convinced that somebody, somewhere, is taking great pains to provide a ready-made solution to the crime.