As the middle—and least marriageable—sister in a bevy of swans, Lavinia Wynnburn is quite content being the odd duck out. This way, she’s free to commit social faux pas without anyone much noticing. Until the Duke of Beaubrooke turns up the morning after a ball, asking for her hand in marriage. Alexander Reddington doesn’t particularly care for social niceties, nor is he particularly good at them. But now that the spare has become the heir,...