McCammon, Robet R. Matthew Corbett mysteries #7

The year is 1703. The woman Matthew Corbett loves is rapidly deteriorating. A drug forced on her by criminal mastermind Professor Fell has destroyed her sanity. And, the one thing that could save her - a book of potions - was stolen, during an assault on the English village, where she has been living under another name, an attack directed by a deranged man known as Cardinal Black. Matthew is a professional problem solver employed by an agency in New York, but this case is personal. To save Berry Grigsby, Matthew will journey to London with one of Fell's henchmen and attend an auction to which Black has summoned unsavory characters from near and far-all vying to possess the powerful volume. But, before Matthew can obtain the book and heal Berry, he must survive Cardinal Black

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