Two friends are kidnapped by several masked men. One of the friends is a doctor, and the masked men say that they need him to assist a noblewoman, who is about to give birth. When they reach the house, they find no such noblewoman, only a dead man. Another man, known only as A.M.C., bursts in at this point and declares that the man died of opium poisoning. The doctor writes a letter to a newspaper editor, setting out the facts as he knows them. These facts are rebutted first by a friend of A.M.C. and then by the first masked man, who explains the whole story...