Jeffries, Sabrina. Designing debutantes

Rafe Wolfford courts Lady Verity as a ruse to discover whether she or anyone else in her party planning company is leaking information to the French, in the third novel of the series following What Happens in the Ballroom

As a viscount's heir, Rafe Wolfford is obligated to take a wife someday. But she must be the right sort of wife--not too independent, and not inclined to delve into his escapades as a spy. The forthright, perceptive Lady Verity is altogether the wrong choice. But Rafe's courtship is merely a ruse to discover whether Verity or anyone else associated with Elegant Occasions is leaking crucial information to the French. That mission is all that matters--until fate, and desire, intervene. After enduring one disastrous engagement, Verity won't easily open her heart again, preferring to devote herself to Elegant Occasions. Rafe is charming, handsome, and kisses like the very devil, but she knows he's harboring secrets. Still, when her ex-fianč tries to ruin her reputation, Rafe offers his hand. For the sake of her family and business, Verity has little choice but to accept. Yet turning this arrangement into a true marriage will require daring and trust--which neither will embrace easily, making surrender all the sweeter