Strange things are happening in London. The star greyhound racer vanished from his 100-square-foot secure box without the gate being forced. Two pigeons distinctly saw a salamander generate a gigantic flash that plunged the entire Piccadilly district into a blackout. A guinea pig was abducted from a 70th-floor flat by a flying creature. Witnesses described a dragon. In the eyes of animals, these mysteries are insoluble. In all of London, there is only one animal capable of tackling such enigmas: a hamster detective named Clever – who consults in the basement of a pet shop in the Lexington district. Clever's reputation is well established: she is gifted with a prodigious sense of observation and gifts of deduction that leave ordinary London animals speechless. Clever may be the smartest hamster in the world, but there are times when things don't go as planned. You have to be able to act without thinking too much. In these cases, Clever knows she can count on her little brother Bro, who is always ready to attack opponents much bigger than him and take enormous risks. The dangers to be overcome are on a par with the extraordinary cases - bordering on the supernatural - that Clever and Bro face. Will they be able to triumph and solve these mysteries that Scotland Yard is breaking its teeth on?