Sandra is driving in the middle of the scorching desert, trying to reach her husband, in the safest SUV ever conceived: the MONOLITH. Seated behind her and belted in, is David, her 2-year-old son who's playing with her cellphone. Suddenly she hits a deer, stops and gets out of the car, and then David, by mistake, locks down Monolith's safety closure from the cellphone. With the car turning into an oven and no way to open the car from the outside, it's a rush against time to save the child.