Widowed and threatened with penury by her heartless in-laws, Eleanor - Lady Ulster - hatches a plot to save herself. Determined to produce the Ulster "heir", she seduces a stranger at a tawdry masquerade. Little does she know, this magnificent masked lover is none other than her husband's greatest nemesis. And God knows Ulster had plenty.
Ethan Pennington is mortified to arrive at a house party and discover Lady Ulster in attendance. He has wanted her and hated wanting her - his enemy's bride - for years. When he overhears Eleanor's predicament and her plans to place a cuckoo in the Ulster nest, he is more than willing to oblige. The opportunity to finally claim her - while taking the revenge he craves - is more than he can resist. Ethan strikes a bargain with Eleanor, promising to provide her with the heir she so desperately needs...if she will meet his needs in return. Every decadent one of them.