Sherlock Holmes and Dr. Watson board the Titanic on its ill-fated maiden voyage, where Holmes is to carry out a secret government mission. 
Soon after departure, highly important submarine plans for the US navy are stolen. Holmes and Watson must work through a list of suspects which includes Colonel James Moriarty, brother to the late Professor Moriarty - but will they find the culprit before tragedy strikes? 
Sir Arthur Conan Doyle's timeless creation returns in a new series of handsomely designed detective stories, encapsulating the most varied and thrilling cases of the world's greatest detective.