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Jenna is involved in a car accident with her boyfriend Jamie, which results in Jamie's death. The incident leaves Jenna deeply traumatized as she struggles to cope with her loss. She begins her journey of emotional recovery following this tragic event.

Three years after the accident, Jenna is invited by her best friend Renee to spend a weekend at a lakeside cabin. The group plans to escape their routines and enjoy the nearby festival happening in the town. Jenna agrees, seeking a temporary distraction from her past grief.

The group arrives at Wade's lakeside cabin where they are greeted by Wade himself and his friendly dog, Beau. They settle in for the weekend, preparing for the festivities and planning to attend a nearby festival at night. Wade mentions he might not be around while they are out due to work commitments.

The group discovers Wade's built sauna and decides to try it. They enjoy the heat and spend time inside, but as the temperature rises, they decide to cool off with a swim in the lake. They remain unaware of the danger looming inside the sauna.

Michael gets high after using marijuana given by Wade, while Renee rebuffs his sexual advances, leading to tension. Michael angrily leaves the sauna, feeling upset and misunderstood. The group continues their activities, unaware of his departure.

The door to the sauna becomes blocked from the outside, trapping Renee, Jenna, and Ian inside. They attempt to break the small window to escape, injuring Ian in the process. The temperature inside continues to rise dangerously as they struggle to find a way out.

Back in town, Wade handles fireworks for the festival, while his dog Beau detects the screams from the sauna. Michael visits Wade, misunderstanding the situation, believing the trio has left for the party, as he is still high and distracted.

As Renee becomes sick from the heat, she breaks the hidden controller in the sauna, hoping to lower the temperature. Jenna protests, but Renee continues, inadvertently causing the heat to increase further. In the chaos, Jenna hits her head and loses consciousness.

Ian, in hysteria, burns himself to prevent the steamer from further heating, which results in his death. Jenna, severely wounded, manages to hallucinate her escape from the sauna. Wade finds her near the broken window and helps her breathe again.

Michael returns to the cabin, unaware of his friends' captivity, and mistakenly believes they have gone to the party. Wade discovers Jenna and Renee alive inside the sauna, concluding the traumatic ordeal. Paramedics are called to take the girls to safety.