Hard Way (Jack Reacher, No. 10) by Lee Child

Jack Reacher is alone, the way he likes it. He watches a man cross a New York street and drive away in a Mercedes. The car contains $1 million of ransom money. Reacher’s job is to make sure it all turns out right – money paid, family safely returned. But Reacher is in the middle of a nasty little war where nothing is simple. What started on a busy New York street explodes three thousand miles away, in the sleepy English countryside. Reacher’s going to have to do this one the hard way.