The mysterious medium known only as Methuselah Kzradock is conducting a series of horrific seances in Paris, under the treatment of Dr. Renard de Montponsier. But Montponsier begins to doubt the ravings of Kzradock--and their possible meaning--as he delves further into the borderline between reality and madness. An early twentieth-century mystery novel, translated for the first time into English.