Without Fail — Lee Child

Skilled, stealthy, and unknown, Jack Reacher is the perfect man for the job: to assassinate the vice president of the United States. Theoretically. The head of a high-level Secret Service security detail wants Reacher to find the holes in her system - and fast. A group of desperate men already have the vice president in their sights. And they will stop at nothing to realize their objective.

The assassins have planned well. But they haven't planned on Reacher.