November 1907. George Dillman and Genevieve Masefield sail from Liverpool to New York on the maiden voyage of the luxurious Mauretania. Employed by the Cunard Line again as private detectives, they pose as passengers on what proves to be a very eventful crossing. Dillman is instrumental in rescuing a crew member from being washed overboard in severe weather, but he is unable to save one of the first-class passengers from the same fate. At first,...

Working as ship detectives for the passenger lines of the early twentieth century, George Porter Dillman and Genevieve Masefield discover during an Atlantic crossing aboard the Celtic that one of their passengers is Sir Arthur Conan Doyle.