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 …