Aron Ralston, an experienced 27-year-old outdoorsman, was on a days solitary hike through a remote and narrow Utah canyon when he dislodged an 800-pound boulder that crushed his right hand and wrist against the canyon wall. Emerging from the searing pain, Aron found himself completely stuck. No one knew where he was; no one was coming to rescue him. With scant water and food, and a cheap pocketknife his only tool, he eliminated his options one by one. On the fifth night, wracked by delirium and uncontrollable shivers, Aron scratched his epitaph into the rock wall, certain he would not see daylight.

Yet with the new morning came an epiphany: if he could use the rock's vise-like hold to break his arm bones, his blunted pocketknife could serve as a surgeons blade....