The London Borough of Hackney is run by the crime syndicate Bai Ze. One night an expensive horse carriage arrives at their headquarters. Behind the carriage is the leader of the Bai Ze, Mr. Quin, hanging at the end of a bloody rope. The journey here has stripped him of his clothes and shredded most of his skin off him. He rasps one final word to his second in command: 'Mogwai'. It's the Cantonese word for the devil. In London the normal order of the criminal syndicates has been broken and a new dangerous villain is playing to win the entire game. It is also ruining the business of the Bohemia - the secret underworld club. The members are being killed and club owner, Irene Adler, must seek the help of the only person who can solve these mysterious murders - Sherlock Holmes. Somewhere at the other end of all these murders lies the truth about Sherlock Holmes and Moriarty. Follow the third instalment of the Becoming Sherlock series.