The Sleeping Sphinx Author:John Dickson carr Dr. Gideon Fell solves the strange case of the woman who murdered herself. — Seance at Caswll Moat -- it started as an innocnet game. Each guest wore the death mask of a famous murderer. The host wore the green mask of the executioner. The doors were locked. A bowl of burning alcohol wavered with a bluish flame. Faces moved and dodged in the dark... more ». Suddenly a cold chill swept over the room. A woman screamed. In a sealed vault nearby, ancient coffins moved, and murder and nightmare evil walked abroad.