Claiming His Mistress (Harlequin Presents # 2206)

When hotshot financier Carver Dane attends a masked ball, he isn't expecting a fiery encounter with a woman who ignites the same compelling desire he once knew with Katie Beaumont. Katie is stunned by her response to a sexy stranger. The last time she felt such intense longing was ten years ago - in the arms of a man she was forced to give up. When the masks come off, and the past comes alive, Carver is determined to claim Katie. But as his mistress or more?