A robbery. Two missing persons. A case for Sherlock Holmes. Mrs Hudson asks the master detective for help: her cousin Margery Mapleton has disappeared. Shortly before, her employer, a respected archaeologist, was attacked. Since then, there has been no trace of him or a large sum of money – and suspicion falls on Miss Mapleton, of all people. Holmes and Dr. Watson travel to Bloomsbury Hill to investigate the case. Clues pointing to connections with the Camorra are mounting – but then a guest at their hotel is robbed, and all the evidence seems to be pointing in the wrong direction…