An interesting in-depth look at the world of hard-core rock climbing. Provides some useful context to the achievements and ethos of Alex Honnold. I'd say you have to be pretty keen on rock climbing (or Honnold) to really appreciate the book but I found it enlightening and it sheds some light on Honnold's personality that was missing from the Free Solo film. The book is about 75% fun facts abd stories from the world of extreme climbing, and 25% about Honnold and his legendary climb of El Capitan - perhaps not quite what it suggests on the cover.