My Reward by Jennifer Hanks

In Noah Striker’s world, control is everything.
Throughout his life, he’s learned the ramifications of trusting another person and refuses to be seen as weak or vulnerable again. The only person he wants the world to see is the hard, unbending man he’s become.
But that all changes when he’s assigned to protect Beth Sullivan.
For four years, he watches quietly from a distance, never understanding his need to keep her safe or the loyalty he feels, but when another threatens her, keeping his distance is no longer an option.
Neither is denying the passion that’s always lingered between them.
With an enemy on the hunt, Noah Striker will face the fight of his life.
But can he relinquish the control he’s always believed saved him in order to save her?