Mr Cavendish, I Presume (Two Dukes of Wyndham)

Engaged to the future Duke of Wyndham since she was just six months old, Amelia Willoughby is beginning to get tired of waiting for Thomas Cavendish, the oh-so-lofty duke, to decide it's finally time to get married. But just when Thomas begins to realise that his bride might be something more than convenient, a long-lost cousin arrives, who may be the true Duke of Wyndham. If Thomas is not the duke, then he's not engaged to Amelia. Which is the cruelest joke of all, because this arrogant duke has made the mistake of falling in love...with his own fiancée!