|A book about how Garry messed up on the 16th of July 2015 and a bunch of people accidentally got this item.|
—Information accurate as of: build win/644769dev
The book is an item like no other as it serves no actual purpose. According to the in-game description of the item, it was obtained by a few players whilst playing the game. This according to the description was not meant to happen.
The item remains in the game but is no longer accessable to regular players. The only way to obtain the item is by admin commands.