Heidi Hart

I've never read Anna Campbell, but I enjoyed this holiday novella well enough that I intend to check out some of her longer works (even though historical romance hasn't been working well for me lately). 

Philippa's beautiful, flirtatious, scatterbrained sister Amelia has just become engaged, but her reputation could be ruined if anyone learns of the love letter Amelia sent to the rakish Earl of Erskine (who is not her fiancé). Philippa breaks into the Earl's chamber in an effort to recover the damaging letter, but her own reputation is destroyed when she and the Earl get trapped in the chamber together. When they are discovered in the morning, only a hasty marriage can repair the damage -- but Philippa doesn't want to be tied forever to a man who doesn't want her. However, having lived so long in her sister's shadow, Philippa underestimates her own charms. The Earl wasn't looking for marriage, but he's not at all sorry about his lot. 

Short, but well-written, sexy, and satisfying. As I said, I'll be checking out some of Anna Campbell's longer work!