Asherwick - Gen-Heirs: The Guardians of Sziveria, #4

She broke his heart.Besides work, Sylphine is the only thing that's ever gotten under Jonathon's skin. He'd thought she was out of his life for good, but he was wrong. When she arrives, desperate for his help, honor won't let him walk away from her. But warring anger and desire leave him in a precarious situation. Everything would have been so easy if she'd only stayed out of his life and let him get over her.
Now he controls her future.With her future at risk of falling into the hands of an enemy, Sylphine turns to the one person who can help-and the one person who probably doesn't want to. Jonathon agrees, but not without conditions, compelling her to realize all her previous fears can cost her everything if she can't learn to trust him. Together, they discover the treacherous reason someone is desperate for her shipping empire, and the reckless measures her adversary will go to claim her.
And as the tension heats up between them, Jonathon soon makes it clear he'll be the one staking his claim.