The Unscrupulous Uncle (Signet Regency Romance)

She had adored her older brother's best friend since childhood...but that was long ago. Now an orphan in a household that has reduced her to shocking servitude, he has suddenly returned. But why does he propose marriage, when it is clear that he loves another? Is he paying a secret debt, or simply intent on making a fortune through her? She must quickly find answers, even if it breaks the heart she lost to him long ago....