Trailer
Traveling on the overnight train from London to Edinburgh, Sherlock Holmes and Dr. Watson are accompanying Roland Carstairs and his mother. They are there to protect the famed Star of Rhodesia, a 400-plus carat diamond that Mrs Carstairs had received on her 25th wedding anniversary many years before. There had been an attempt to steal the diamond while in London but when young Carstairs is killed and the diamond stolen, Holmes realizes that it must be the work of the noted thief and criminal, Colonel Sebastian Moran.