Lisa finds herself confined in a series of dangerous trap-filled tubes after a car ride with a mysterious stranger. The only clue she has to help her understand the situation is a watch on her wrist that has an ominous countdown. Soon, she learns that every 8 minutes, an occupied area burns down, so she has to crawl painstakingly to safe spaces to survive. In order to set herself free, she must confront the memories of her deceased daughter.