A half-century-old curse lies over the small community of Ridgewater ever since Sarah Chase died in a car accident during a teen-angst-driven game of chicken back in 1962. She perished in the back seat of a 1961 Impala, accompanied by a group of boys who called themselves "the big four". She screamed as the car careened through a guardrail and plunged into the icy river water beneath. The four boys survived. Sarah did not.

Teenagers still race and party at the Milvian Bridge where Sarah's car went over, especially on the anniversary of her death, in hopes of catching a glimpse of her unsettled ghost.

But the partying teenagers of Ridgewater don't know that in life Sarah belonged to a group of teenage girls who practiced witchcraft. They don't know that Sarah seeks to use her powers from the grave to avenge her unrequited vendetta. They don't know that Stan Corelis, the driver of the Impala that terrible night, has passed away, freeing Sarah to unleash her anger.