The last and least of the long-lived series has Powell and Loy attending a party on board a gambling ship. When the bandleader is murdered, Powell at first doesn't want to take the case, even though the owner of the ship--Cowling, who had argued with the bandleader beforehand and who is
now the chief suspect--asks him to help clear his name. But when someone takes a shot at the ship's owner, Powell's curiosity is piqued and he throws himself into the investigation. He enlists the help of musician Wynn and soon has put together an interesting list of suspects, including gambler
Bishop, who owed the dead man $12,000; clarinet player Taylor; Morgan, the father of Cowl...