You Only Love Once — Caroline Linden

The most dangerous pursuit . . . is passion.

Devilishly handsome and absolutely fearless, Nate Avery is in London on an important mission -- and paired with an English spy, who is meant to watch him as much as aid him. But much to his surprise, that spy turns out to be an alluring and enigmatic temptress.

Angelique Martand may be a beauty, but she's also the most dangerous agent in England -- and this job is far beneath her. She doesn't like the way the dashing American looks at her, or the way he makes her feel -- like a woman, not like a spy. She can't afford to fall under Nate's spell and indulge her desires, no matter how desperately she wants to. But soon it becomes clear that there's more to this job than either of them knows . . . and the secret they uncover could cost them their lives as well as the once-in-a-lifetime passion that burns between them.