As Goodman buys a boat Dan Hagen, wealthy philanthropist and oceanographic leader of a diving party, is shot on board his yacht whilst the four members of his group are all underwater and in each other's sight. Goodman is puzzled by the appearance of a toy soldier next to the corpse and learns, not only that Dan's ex-spouse and current trophy wife are in the party though apparently friends, but that Dan's colleague Sam Blake had argued with him over a professional matter and student Jonathan Taylor was a drug smuggler Dan exposed. Taylor is arrested but ultimately the toy soldier gives Goodman the clue to the way the murder was carried out.