When Hallie Jacob's grandfather becomes ill, her parents remove her from school in the middle of her senior year and they all head to Colorado to spend his last days with him. There Hallie is surrounded by cousins but family drama prevents her from hanging out with them. But when she sneaks off with them to an abandoned ski slope for a bonfire, they get caught in a mudslide. Some in their group need medical attention so Hallie and Jonah Ramirez, her cousin's best friend, set off down the mountain to get help. Now the two will have to trust each other if they want to survive.