The Difference a Dare Makes by Alyssa Clarke

Lady Agatha has spent three London seasons without an offer, achingly aware that several of her friends found love matches because they dared to reach for adventures and new experiences. She is determined to take some risk hoping it just might be what she needs to make a difference in her humdrum life. Striding forward with her list of dares and wagers to satisfy, the last thing Agatha expects is to be caught in a compromising position with the Duke of Ranford…or that she would be forced to marry a rogue who offers none of the passion and grand love of which she dreamed. Soon Agatha has little choice but to wage a most sensual battle with her husband, where the stakes are the duke’s heart or the bitterest disappointment.