The Mistletoe Duke by Sabrina York

Widowed Jonathan Pembroke, the esteemed Duke of Devon, has been dodging marital bliss for far too long. At least, according to his mother. It’s time for her son to marry again and settle down, preferably with a woman who can manage his hellion daughters. So the crafty dowager plans a Christmas party, replete with mistletoe, to vet the eligible partis. She enlists her companion—and Jonathan’s childhood friend—to help in this quest. Which is awkward… because down-on-her-luck and decidedly un-duchess-like Meg Chalmers might want to capture the duke under the mistletoe herself.