Mystery of the Heart — Jillian Kent

Lord Eden is intrigued by Lady Mercy Grayson's secret, but how can he hope to gain her heart if he is forced to betray her? Lady Mercy Grayson longs to be a physician like her older brother, Lord Ravensmoore. However, society would never tolerate a female physician, let alone one who is a noblewoman. So Mercy takes matters into her own hands, disguising herself as a man to get through medical school. But when a colleague grows suspicious, Mercy is in danger of losing more than her dreams. Returning home from a secret voyage for the regent, Lord Eden agrees to give Mercy passage back to London. As their attraction to each other grows, they face circumstances, decisions, and treachery that could forever change the course of their lives.