The movie is happening on the train which travels from London to Edinburgh. Sherlock Holmes and Dr. Watson are invited by Lady Margaret and her son Roland to protect a priceless diamond called the "Star of Rhodesia". But the diamond was stolen and due to the diamond her son has been killed by murderer. Since passengers cannot escape from the train and various suspicious characters in. the film it builds an intense atmosphere to attract audience to watch.The atmosphere of the movie is dark and blurred, with dim lighting emphasizing the confined nature of the space and immersing audiences into a mysterious atmosphere.