The early-20th century finds the Van Dorn Detective Agency’s chief investigative officer, Isaac Bell, and partner Archie Abbott on board the luxury ocean liner Mauretania. They hold a Wall Street stock swindler in protective custody until they get to his trial in New York. Abbott’s wife, Lillian, enjoys the voyage as does Bell’s long-time fiancée, Miss Marion Morgan, a hard-working moving picture director. The two men secretly plan Bell’s marriage on board the sh