In an alternative Steampunk universe (c.1885), the plans for Captain Nemo's mysterious Nautilus submarine have been stolen from the British Secret Service. There is only one man who can solve the case: Sherlock Holmes. With his bionic sidekick Doctor Watson, and his brilliant and lethal sister, Mycroft Holmes, Sherlock unravels a mystery that will shake the foundation of the British Empire. Adapted by P.C. Martin from the short story 'The Adventure of the Bruce-Partington Plans' by Sir Arthur Conan Doyle (c.1912), 'Steampunk Holmes' is a convergence of one of Doyle's favorite Sherlock Holmes stories with Jules Verne's 'Twenty Thousand Leagues Under the Sea' (c.1870).