26岁的约翰·琼斯是名”洞穴探险家”，他喜欢挑战各种不同大小的洞穴攀爬。2009年，琼斯挑战犹他州坚果石灰洞时，不幸陷入一个宽18英寸，深150英尺的洞中，因为洞穴其中一段的空间实在太过狭小，他整个人被卡死。救援人员英勇地援救他，但是琼斯的身体正在一步步地突破极限......

Hunted by government agents and constantly assaulted by a cartel of vengeful thugs, an amnesiac known only as "626" searches for her true identity while protecting a teenage girl who shares her superhuman abilities; but when 626 uncovers the horrifying truth about her past, she must infiltrate enemy headquarters to expose a corporate conspiracy that threatens the free world,before she and her companion are silenced forever.