London, at the beginning of the 20th century. At Baker Street 221b, known as the adress of Sherlock Holmes, the brilliant and famous detective, the annual "International Conference of Master Detectives" ist taking place. Just when the discussion closes in on the future of magnifiying glasses in modern crime-fighting, Holmes' landlord bursts in with a telegram: "robbery at the tower stop one injured stop theft of crown jewels could be prevented stop criminal on the loose stop request help stop scotland yard". Immediately, the detectives interrupt their discussion and start hunting the criminal. They comb the whole city. Eye witnesses are interrogated and suspects are examined - some detectives even dive into the Thames to search for the weapon used for the robbery. Who will prove that he is the smartest and most successful sleuth in this contest of master detectives? Who will be the first to deliver the criminal's identity to Scotland Yard?