The Dangerous Lord by Sabrina Jeffries

To prevent a dear friend from wedding Ian Lennard, the notorious Viscount St. Clair, Felicity Taylor reveals his shady past in her anonymous London gossip column. But the dauntless miss never imagined St. Clair’s rage, for the dangerous rake is now short a bride and desperately needs an heir. Threatened with exposure and ruin, Felicity has no choice but to marry the hot-blooded lord herself. Ian needs a wife merely to secure his fortune, but in Felicity he has met his match in both wit and passion. And no danger is greater than the possibility that he might actually be falling in love with his fiery new bride!