Emily Garvis is sure that their dead father is sending them messages through the Ouija board. Her sister Gale, more practical, believes that they come instead from Emily's troubled subconscious.

In either case, the warnings are horrifying: madness and danger and death.

Then Emily is brutally murdered in her own bedroom. Heartbroken and terrified, Gale realizes that her occasional mental blackouts may be the first symptoms of insanity - and that she too is doomed by the message from a ghost.