四个朋友周末去乡村度假，没想到，快乐的旅程转眼变成了噩梦，三个人被锁在了封闭的桑拿室，时间一分一秒过去，他们将如何逃脱这即将到华氏247度的地狱... Four friends travel to a lakeside cabin for a carefree weekend, the fun turns into a nightmare when 3 of them end up locked in a hot sauna. Every minute counts and every degree matters as they fight for their lives in the heat up to 247°F.