Sebastian Blake, His Grace the Duke of Winterhaven, has a hard and fast rule when it comes to mistresses. He never keeps one longer than a turn of the season. But he's never met a woman as tempting as Arabella St. George...A fiery operatic diva, Arabella is blackmailed into helping the French. When she gives the envelope intended for a French assassin to the Duke of Winterhaven by mistake, she'll do anything to retrieve it. Even if she has to seduce him to do it...