In a romantic fantasy set in a magical Regency England, a sorceress must balance magic-ending familial duty with her ambition to become her world's first great sorceress.

After a tragedy too painful to bear, former novelist Lily Albrecht has resigned herself to a dull, sexless life as a rare book dealer. Until she gets a lead on a book that just might turn everything around. The Book of the Most Precious Substance is a 17th century manual on sex magic, rumored to be the most powerful occult book ever written--if it really exists at all. And some of the wealthiest people in the world are willing to pay Lily a fortune...