A killer wearing a gas mask stalks and murders a group of thieving friends at a birthday party. Seeking an escape from the tragedy, and to lie low while the police do their job, Melissa and her remaining friends head to the countryside where an even more sinister plot unfolds.

Giulia lives with her mother in a house near the forest. On her 14th birthday, she discovers that the forest is in danger and decides to protect it by going to live in a tree.