Based on the best-selling novel by Gary Brandner, this horror film makes effective use of the classic werewolf tale. Dee Wallace stars as Karen White, a popular female reporter in Los Angeles who cannot escape the horror of a traumatic experience that she suffered while trying to capture Eddie Quist (Robert Ricardo), a dangerous serial killer. When her psychologist (Patrick Macnee) recommends a retreat to "The Colony," up the Northern California coast, she reluctantly agrees, hoping to recover from her nightmarish visions. Karen and her husband (Christopher Stone) arrive at the remote retreat and are shocked at the bizarre behavior of the motley crew of residents. Lurking in the ominous Northern California woods, blanketed by fog, strange sounds can be heard at night, luring the members of the retreat into the forest. In anguish, Karen stumbles on the deadly secret of the community: when sexually excited, they turn into werewolves! The horrified journalist tries to escape from the retreat, battling the lair of leering lycanthropes in a fight for her life. Superb special effects add to the picture, with several shocking human-to-monster transformation sequences.