The horror started when a 'controlled' experiment in prophetic dreaming got wildly out of control. It was aborted - but not before some dark door to a screaming shadow-world of nightmare had been opened and left ajar. Now, as a bitter winter holds the country in its corpse-cold grip, a monstrous presence begins to invade the lives of the original participants. Creatures glimpsed fleetingly in the original group dream eleven years ago are drawing them inexorably into a dreadful vortex of hallucination, insanity - and worse. One by one the dreamers succumb to the diabolical force that threatens much more than mere lives. Only Molly, a young television production assistant, decides to fight to understand the true nature of the horror before it can absorb her forever...