You are hired as a summer fire supervisor in the Vierlême National Park. You are assigned to Tower 13 and you drive there in your RV while texting your partner. They suggests that you eat in a restaurant in the small town of Marmomble, which you did upon your arrival. You learn that several townspeople - including its waitress, Marie - have mysteriously disappeared in the national park and you are advised to be very careful. You leave for Vierlême in your camper van immediately afterwards.

After a more or less calm week, an event particularly struck you. Victim of a nightmare you suddenly wake up around 2:27 a.m. A shadow is visible on the wall and someone can be seen through the window, but when you stand up and look outside, the figure disappears. You open the door and discover an animal skull and candles with disturbing symbols. Then...heavy breathing is heard. You see a shadow on the wooden stairs leading to your tower. Will you confront the stranger or lock yourself in your cabin? In the distance an owl hoots in the night.