Late one night, young Evelyn Cummings Whyte bumps into Justin Powell as he exits a married woman's bedroom. Evelyn agrees to keep silent about the indiscretion, and Justin is left in her debt. Now, ten years later, Evelyn calls in the favor. Ever since her aunt eloped to France, Evelyn has been trying to keep Whyte's Nuptial Celebrations running smoothly, and now has one last chance to keep the company solvent. A wealthy American client insists on holding her second wedding at North Cross Abbey, which just happens to be Justin's ancestral estate. Justin agrees to let Evelyn use his digs on one condition: he'll be on the premises. Thinking that the wedding offers the perfect cover for his plan to ferret out a dangerous enemy spy, Justin quickly discovers just how challenging, yet enjoyable, it is keeping Evelyn unaware of his real plans, and out of danger.