The night she arrives at the remote Collingwood lakehouse, Mari (Sara Paxton) and her friend are kidnapped by a prison escapee and his crew. Terrified and left for dead, Mari's only hope is to make it back to parents John and Emma (Tony Goldwyn and Monica Potter). Unfortunately, her attackers unknowingly seek shelter at the one place she could be safe. And when her family learns the horrifying story, they will make three strangers curse the day they came to "The Last House on the Left".