Being the son of a famous illusionist is not easy, but at the same time it’s a lot of fun. Traveling the world, performing on stage and receiving enthusiastic applause - this was the life of Lucius until his mother Irene Adler was in mortal danger. Lucuis could not even imagine that he would end up in the care of London's most famous detective, Sherlock Holmes! He also didn’t think that the house on Baker Street would be so boring... Everything changed when the boy learned about a strange incident at the British Museum. Someone climbed into one of the halls at night and stole only one ancient artifact: a golden crystal hidden in a figurine of an ancient god. Why did the thief decide to kidnap him? What secrets does the ancient crystal keep? Lucius decides to unravel this case! True, first he will have to make new friends who will help conduct the investigation.