贝姬（格雷斯·卡罗琳·柯里 Grace Caroline Currey 饰）与亨特（维吉尼亚·加德纳 Virginia Gardner 饰）是一对亲密好友，同时两人都对攀岩这项极限运动有着无比痴迷和热爱
但在某次意外过后，贝姬的人生坠入谷底 她目睹丈夫丹（梅森·古丁 Mason Gooding 饰）攀岩时意外坠亡，这让她备受打击，也从此远离了这项运动 为了帮助好友振作，亨特想方设法说服贝姬跟她一起去攀爬一座高达610米的废弃信号塔 几经挣扎，贝姬最终接收好友的邀请，而这也正是二人噩梦的开始
由于年久失修，电视塔许多部件老化脱落 可是一边攀爬一边直播的二人忽略了这些隐患的存在，与天空越近，便与死神更近了一步…
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