Henry Kendall went to sea as a cabin boy at the age of 15. By the time he was 32 he was the captain of an Atlantic liner, and in 1910 shot to fame when he sent a celebrated wireless transmission from the SS Montrose, as she headed out into the Atlantic Ocean: "Have strong suspicions that Crippen, London cellar murderer and accomplice, are among saloon passengers." The message sparked off an extraordinary chase as Inspector Walter Dew of Scotland Yard...