Showing Force of Nature by C. J. Box

Joe Pickett's outlaw companion, Nate Romanowski, faces the battle of his life: one he may very likely lose. Nate knows too much about Special Forces Black Ops in Afghanistan - and he must be silenced.

Nate's former comrades know the time has come to end the threat once and for all. And they do it by incorporating many of the same tactics that served their unique and secret unit well in the Middle East: recruiting locals. Nate can trust no one except Joe Pickett, who is constrained by his oath and duty to the law and the state.

But Nate must involve Joe because he knows his enemy will strike at his friends in order to draw him out. The entire Pickett family will be a target. Nate can only fight back outside the law, and Joe must make a choice: help his friend or keep the peace?