The sixteen year-old teenager Nicole Walker has moved to the house by the lake of her father, the architect Steve Walker, to live with her stepmother Laura and her brother Toby. Her best friends are Margo Masse and Gary Rohmer that study with her in the high school. When Nicole meets David McCall in a night-club, she has a crush on and dates him. David becomes obsessed by Nicole and one day he sees her friend Gary kissing and hugging her and he hits him. Nicole breaks with him but David continues to follow her. Steve decides to investigate the young man and he finds that he is an orphan that has spent most of his life in reformatories. The hell breaks loose in Nicole's life when David kills Gary and trashes the Mustang of her father. Steve breaks in his house and destroys everything inside. Now David and his gang go to Steve's house to payback.