The Affair: Jack Reacher Series, Book 16 (paperback) Lee Child
Everything starts somewhere. For elite military cop Jack Reacher, that somewhere was Carter Crossing, Mississippi, way back in 1997.
Reacher is ordered undercover to investigate the murder of a young woman. Evidence points to a U.S. soldier with powerful friends. Once in Carter Crossing, Reacher meets local sheriff Elizabeth Deveraux, who has a thirst for justice and an appetite for secrets. Uncertain they can trust each other, they reluctantly join forces. Reacher works to uncover the truth, while others try to bury it forever. The conspiracy threatens to shatter his faith in his mission— and turn him into a man to be feared.