When at least one of the investigators experiences sleep disturbances, an occupational hazard for investigators exposed to the horrors of the Cthulhu Mythos for any length of time, they find themselves referred to the Torgerson Sleep Research Clinic, where they find that several patients have been experiencing disturbing nightmares before disappearing. The investigators must discover the source of the horror that stalks the patients during those little slices of death we call sleep....