Reddit reviews Open Net: A Professional Amateur in the World of Big-Time Hockey

Open Net by George Plimpton. He was a hell of a sportswriter and this book details his time in the Bruins training camp having agreed to work toward playing goalie for 5 minutes during a preseason game for the 78-79 (I think) season.

Lots of locker room stuff, asides about personalities on the team, and interesting notes about Bruins and hockey history. And it's a short read.