Valentine's Day is coming around and the young people of the small mining town of Valentine's BLuffs are organising a party. A few decades earlier an explosion at the mine trapped six miners underground. One, Harry Warden, survived, though in a deranged state. Warden is sent to a mental hospital but escapes and murders those he deems responsible for the mine accident. Now people are being brutally murdered again, and the townsfolk suspect that it is the work of Harry Warden.

Nerdy, reserved bookworm Needy Lesnicki, and arrogant, conceited cheerleader Jennifer Check are best friends, though they share little in common. They share even less in common when Jennifer mysteriously gains an appetite for human blood after a disastrous fire at a local bar. As Needy's male classmates are steadily killed in gruesome attacks, the young girl must uncover the truth behind her friend's transformation and find a way to stop the bloodthirsty rampage before it reaches her own boyfriend Chip.

Is becoming a woman analogous, in some deep psychological way, to becoming a werewolf? Ginger is 16, edgy, tough, and, with her younger sister, into staging and photographing scenes of death. They've made a pact about dying together. In early October, on the night she has her first period, which is also the night of a full moon, a werewolf bites Ginger. Within a few days, some serious changes happen to her body and her temperament. Her sister Brigitte, 15, tries to find a cure with the help of Sam, a local doper. As Brigitte races against the clock, Halloween and another full moon approach, Ginger gets scarier, and it isn't just local dogs that begin to die.

In Los Angeles, the teenager Sarah Bailey has just arrived from San Francisco with her father Mr. Bailey and her stepmother to live in an old house. When she goes to the Catholic high school, she is not well received by her schoolmates and has a crush on the football player Chris Hooker. He lures her and tells lies and gossips about their relationship. Soon the outcast Nancy Downs, Bonnie Rachel and Rochelle, who are known as witches, invite Sarah to join them. Nancy lives with her drunken mother and her boyfriend and hates him. Bonnie has awful burning scars on her back and has complex. Rochelle hates the racist Laura Lizzie, who despises her color and her hair. Sarah does not know that she is a powerful witch and when they form their coven, they become powerful and cast spells on their enemies. When Sarah feels that something is wrong with her friends, she meets the clairvoyant Lirio that tells that the spells may return three times stronger.

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