White Magic (White, #2)

In Regency London, a young lord sets out to discover the circumstances surrounding his friend's suicide by locating the lady who spurned him. What he finds is an enchanting beautiful woman with some peculiar hobbies: nocturnal activities the lord believes to be sorcery, and an affectionate relationship with a wealthy gentleman. But nothing prepares him for the most startling revelation of all--a passion that suddenly consumes them both...