Frederic Hamilton, an aging millionaire and philanthropist, calls upon Harry Dickson to investigate most curious facts. For some time, he has been having strange dreams in which he appears before a mysterious court eleven masked judges who accuse him of despoiling Humanity. Now, his latest dreams have included physical torture and the pain is still present when he wakes up! Dickson and Superintendent Goodfield travel to Hamilton's residence, but their mission quickly turns into a nightmare.