Running Blind by Lee Child

"Jack Reacher is back, dragged into what looks like a series of grisly serial murders by a team of FBI profilers who aren't totally sure he's not the killer they're looking for, but believe that even if he isn't, he's smart enough to help them find the real killer. And what they've got on the ex-MP is enough to ensure his grudging cooperation: phony charges stemming from Reacher's inadvertent involvement in a protection shakedown and the threat of harm to the woman he loves." --