"Piper Sullivan was in a strange hiking accident last month and has been in a coma ever since. Her older sister, Savannah, can't pretend to be optimistic about it--things look bad. Piper will likely never wake up, and Savannah will never get any answers about what exactly happened. But then Savannah finds a note in Piper's locker inviting Piper to a meeting of their school's wilderness club...at the very place and on the very day she fell. Which means...

The author recounts his harrowing experiences of being trapped for six days in Blue John Canyon in Utah and having to amputate his own right arm in order to save his life.