Solid as Steele by Susan Sleeman

He lost his memory… Mackenzie Steele has been instrumental in keeping Steele Guardians afloat, working long hours for months. Nearing burn out, her family encourages her to take a vacation, and she reluctantly agrees. She needs solitude and quiet, and a vacation rental home in the Oregon desert is just the ticket. But she’s no sooner unpacked her bags when a man lands on her doorstep. A man who can’t remember his identity or why he’s there. All they know is that the name Owen seems familiar to him.

But will finding it bring a killer to her doorstep? Mackenzie shouldn’t trust this man, but something about his earnestness draws her to him, and she agrees to help him determine his identity. When her rental home is bombarded with bullets, she knows she’s accepted a task that could turn deadly, and she should walk away. But by this time, her deepening connection with the stranger keeps her firmly rooted at his side, and she can only pray that she won’t regret her potentially life-altering decision.