Black Ice

When Sherlock and Amyus Crowe, his American tutor, visit Sherlocks brother Mycroft in London, what they find shocks both of them to the core: a locked room, a dead body, and Mycroft holding a knife. The police are convinced Mycroft is a vicious murderer, but Sherlock is just as convinced he is innocent. Threatened with the gallows, Mycroft needs Sherlock to save him. The search for the truth necessitates an incredible journey, from a railway station for the dead in London all the way to the frozen city of Moscowwhere Sherlock is entangled in a world of secrets and danger.