Almost everyone on Earth knows who Sherlock Holmes is. But not everyone knows that he has an equally talented descendant, Sherlock Holmes Fifth. Like his famous ancestor, little Holmes meets "his" Watson, tests him for the role of assistant - and later the boys set up a detective agency.
But their story is not a purely classic detective story, but a real brainstorming session for readers, which will promote the development of logical thinking, teamwork and the formation of correct values. The crime is accused of the youngest detectives. This happened during a visit to the British Museum, when the boys noticed that the valuable chess figure of the bishop had lost his head. There is real chaos, so friends have to be very smart to find what is lost and save themselves.