In Wimbledon, a suburb of London, in an abandoned mansion in the middle of Mulberry Lane, the corpse of a man was found nailed to the wall. The identity of the deceased was quickly established - this is one of the guests of the noble Clavering family. At a reception, a quarrel occurred between the young son of the owner of the house and a certain Count de Louvisan. And a couple of hours later the last one was already dead... The matter, it would seem, could not be clearer. But Scotland Yard Superintendent Necom is very friendly with Clavering Sr. and does not believe in the guilt of his heir, knowing him almost from the cradle. And he asks the great and unique detective, “the man with a thousand faces” - Hamilton Click, to investigate this crime...