Wintersfall - Gen-Heirs: The Guardians of Sziveria, #1

When a professional assassin's daughter goes searching for her mother and sister's killer, she never expected to fall in love.With her inherited ability to handle a gun and know exactly how to use it, Katria is a valuable tool for the Sziverian government. In exchange for a deeper investigation of their deaths, she agrees to work for the First Intelligence Office. Haunted by a dark family history, Sean Blackbain escapes the whispers by leading an Intel Guardian team.
All he wanted was to disappear. Then a botched assignment sends the team home. Sean and Katria learn the contracts they signed three years ago were for more than work. They're married. Away from dark alley danger and secret missions, they find themselves thrust into the glitz and deception of the ranked Guardian society. As a Sympath, Sean can feel and absorb people's emotional states, including the desire his new wife can't hide.
Fighting against their attraction is useless, and he quickly discovers he'll do anything to keep her safe. Which turns out to be more difficult than he ever anticipated. The more Katria digs into the murders, the more danger seems to find her.