Never Desire a Duke (The Neverhartts #6)
Dawn Brower

Grant Barrett, the Duke of Darling, doesn't wish to marry but thinks, perhaps, it's time he does. His title demands it, and so does his meddling mother. An enchanting lady with golden hair and mischievous banter lures him away from the masquerade for a tantalizing interlude. Much to his frustration, she disappears when the bell sounds to remove their masks. He believes he's finally met the woman destined to be his duchess. If only he had a way of discovering her name to ask her...