This is the latest in the Jack Reacher series by Lee Child. I wanted to take my time reading this novel but it was not possible to do so.
Reacher finds a personal ad in the Army Times that leads him to contact some old Army intelligence acquaintances. They want him to hunt down a sniper that he had once jailed but who was not out and thought to have taken a shot at the president of France. This leads Reacher on an international man hunt to Paris and London. The shooter, however, has personal reasons to want to kill Reacher. There is plenty of tension as Reacher deals with some unsavory characters who are protecting the sniper while he avoids being a target himself.
This book will not be easy to put down and I think is one of the best of the series.