Players take on the roles of the members of the superficial gang of the Irregolari from Baker Street, a group formed by Sherlock Holmes to stay informed about everything happening on the streets and to get support with the most mysterious cases. This box presents ten tricky cases to solve. In each case, a set of clues, a map of London, an annuary, and the local newspapers are available. Additionally, there is a list of informants that includes some qualified individuals who can assist with the investigations (forensic experts, criminologists, spies, etc.). With all these elements and your imagination, you will roam the streets of London in search of clues that will allow you to solve the mystery and answer a series of questions surrounding the case. But nothing is as it seems, and you must prove your own wisdom if you don't want to expose yourself to ridicule when facing Holmes in the finale!.