Overwhelmed by her sister Hunter’s death, Jax connects with Luce, Hunter’s fearless friend. To heal, they attempt the infamous plank walk of Mount Kwan in Thailand. After a sudden rockslide leaves them stranded on a fragile plank 3000 feet in the air, Jax must confront her deepest fears and fight for survival to find closure.

贝琪（格蕾丝·富尔顿 饰）和亨特（维吉尼亚·加德纳 饰）是一对喜欢追求刺激的好友，某天，她们攀上一座高达610米的电视塔后，意外受困于顶端，面对恶劣天气和物资短缺，她们必须设法在令人晕眩的高度上活下去。