This is very interesting. This book is about Reacher, but is written by another author. This book takes place 15 years after the 1st Reacher book - The Killing Floor. And the characters (FBI) are looking for Reacher. It was cool to see the story from another angle. There are more in the series that I might read.
The only disappointing part is that they never actually find Reacher, just talk about him.