In 1820, American businessman Nate Avery arrives in London investigating an embezzlement scheme. British spy and assassin Angelique Martand is directed to assist Nate on his inquiry, but also watch him carefully. For their cover, they are to masquerade as a married couple.
Angelique is confused by the assignment as this is beneath her usual type mission. She also is bewildered by her attraction to Nate as he makes her feel like a woman. As they fall in love, Nate and Angelique realize that catching the culprit is not easy and will take care sleuthing to find him and apprehend the embezzler. If they are not extremely careful, unknown adversaries will kill the pretend couple who want to make their relationship real.
You Only Love Once is an exciting late Regency romantic espionage thriller that grips the audience from the moment the lead couple meet. Nate is a solid lead, but Angelique owns the story line as what happened to her as a child and her late mom near Paris during the French Reign of Terror has dominated her life ever since until Nate. Although the plot at times decelerates, historical romantic suspense fans will enjoy Caroline Linden's entertaining tale.