A high school senior, Trish, decides to invite her friends over for a slumber party while her parents are away for the weekend. Unbeknownst to the group of teenage girls, an escaped mental patient with a penchant for drilling his victims to death lurks in their suburban neighborhood. As the party begins, the girls engage in typical sleepover antics, unaware of the danger closing in on them. They are joined by the new girl in town, Valerie, living next door, who is unaware of the threat but becomes an unintended participant in the night's terrifying events.

Meanwhile, as the night progresses, the girls' gathering attracts the attention of a few local boys who aim to play pranks and vie for the girls' affection. However, their lighthearted antics are overshadowed by the psychopathic killer's gruesome spree, as he utilizes power tools to terrorize his unsuspecting victims. The party takes a lethal turn as the murderer infiltrates the house, turning their playful screams into ones of genuine fear. The girls must band together and use their wits if they have any hope of surviving the bloody onslaught that has disrupted their innocent fun.