A fun, if not wholly memorable, mystery set on a ship sailing to Calcutta. The discovery of a clue at a grisly crime scene leads Police Commissioner Gauche to the boat where he tries to find the killer. A Russian detective is also sailing, Erast Fandorin (the central character in the series) and together, and sometimes at odds, they work to discover the truth. A fun historical mystery but not so fun I need to read more.