John Haldane, Earl of Strathairn, is on an urgent mission to find the killer of his fellow spy. After visiting the young widow of one of his agents, Strathairn strengthens his resolve. A spy should never marry, and most certainly not to Lady Sibella Winborne, with her romantic ideas of love and marriage. Unable to give Sibella up entirely, he has kept her close as a friend. Then, weak fool that he is, he kissed her. Lady Sibella Winborne has refused several offers of marriage since she first set eyes on the handsome Earl of Strathairn. Sibella’s many siblings always rush to her aid to discourage an ardent suitor, but not this time. Her elder brother, Chaloner, Marquess of Brandreth, has approved Lord Coombe’s suit. Sibella yearns to set up her own household. She is known to be the sensible member of the family, but she doesn’t feel at all sensible about Lord Strathairn. If only she could forget that kiss.