It's Halloween in West Minister, and teenager Lynn Starks is attacked by a man wearing a pumpkin face mask in the basement of her house. Her younger brother Jonathan is carving a pumpkin in the kitchen and hears her sister crying for help. He uses the knife to protect his sister, stabbing the assaulter. When they take the mask off his face, they realize that the man is Lynn's boyfriend Alec, playing a prank on Lynn. One year later, the siblings move to Carver, and they are invited to a Halloween party in the field. Lynn introduces her friend Tammy to her brother, who is haunted by Alec, and Jonathan stays with Tammy. However, her former boyfriend Lance bullies Jonathan along the night. Meanwhile, several youngsters are attacked by someone wearing a Pumpkin Face mask, carving their faces.