Indiscreet — Mary Balogh

A beautiful, young widow seemed like easy prey for the Viscount Rawleigh. In the country visiting his twin brother, Rex longed for a little diversion. But Catherine Winters was a lady of virtue, and she roundly rejected his improper proposal to become his mistress. Since the handsome lord would not be daunted, Catherine fought the feelings he aroused feelings that brought to life a past she had sought to escape. One kiss could bring her to ruin. But temptation proved a worthy foe--and Catherine could not ignore the beating of her treacherous heart...

Hero: Rex Adams, Viscount Rawleigh
Heroine: Catherine Winters