A group of friends decides to spend a relaxing day in a cabin away from the city, but what starts as a fun getaway quickly turns into a nightmare. The plot revolves around a tragic accident: during a moment of relaxation in a sauna, the door jams, trapping the protagonists in an environment of increasing danger. As the temperatures inside the sauna rise dangerously, pressure and fear begin to surface among the group.
As time goes on, the crisis intensifies. Amidst desperation and a lack of oxygen, tensions start to explode, and each person's dark secrets come to light. Relationships are put to the test, and the bonds of friendship crumble under adversity. With no possibility of escape and the temperature reaching critical levels, the friends must deal with their mutual distrust, as well as the effects of dehydration and panic.
With the anguish of the moment and increasingly desperate decisions, conflicts arise that force each of them to confront not only their claustrophobic surroundings but also their own inner demons. Will they be able to survive this extreme situation together, or will the heat not only burn their skin but also their friendships? This intense experience tests not only their physical endurance but also the strength of their emotional ties.