Four groups of people set out to spend their vacation in the Šumava forests. The chubby medic Rudolf with three friends, Jakub with his girlfriend Saša, Richard with his wife Emma and a group of students led by the charismatic womanizer Mára. Nejpp Már's group with Jakub and Saša. Mára tells everyone by the fire a scary story from the war that was supposed to take place at the place where they were staying. Saša, who is not sure about her relationship with Jakub, is enchanted by Mára and something happens between them at night...

In the morning it turns out that Jakub has disappeared. And while searching for him, another unconscious man is found in the woods…

Who is it? Where did he come from? Where did Jakub go? And what does the mysterious figure in the blue sweater who randomly appears to all the guests have to do with all of this?