The Lady's Physician - Sinclair Brothers, #1

Doctor Xavier Sinclair dedicated his entire life to finding treatments for melancholy, hysteria, and illnesses of the mind so that others did not suffer and die as his mother had. However, when he failed to cure his sister's amnesia, he questioned all that he had learned, especially after an obstinate woman, Lady Olivia Westbrook, challenged his authority. What could a woman know of medical matters, especially something so difficult to understand as the mind and memory? Had Lady Olivia Westbrook been born a male, she would be a doctor.
Instead, she did the next best thing and read every medical journal, paper and book published, and even disguised herself as a man to attend classes and lectures when possible. She had also been a great admirer of Dr. Sinclair until she actually met him and found him arrogant and dismissive. After a battle of wills, Olivia believed she had seen the last of Dr. Sinclair, leaving their disagreements in the past.
Or so she thought until he showed up at Westbrook House, a home for orphans and women seeking refuge from unpleasant situations. Forced together to help solve an attempted murder and a mysterious illness, can they put their differences aside or will their stubbornness stand in the way of love?