[sufue]

Several people upthread have said really good things about Robert McCammon's historical mystery series featuring Matthew Corbett. (I'm quite embarrassed that I haven't gotten around to reading this series, perhaps because I still think of McCammon as a horror writer, and I'm just not into horror. But, given how much I like historicals, and given the recommendations, I really am going to bump it up on my TBR list...)

McCammon seems to come out with a new book in the series every few years; the seventh and most recent (2019) is Cardinal Black, which has dropped to $2.99 at Kindle US right now.

Kindle US: https://www.amazon.com/dp/B099MCC6SN
Kindle US/Smile: https://smile.amazon.com/dp/B099MCC6SN

Spoiler:

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 . . .

The “most intense yet” in the unique series that began with Speaks the Nightbird, Cardinal Black is a brutal and brilliant historical thriller from this New York Times–bestselling and Bram Stoker Award–winning author (The Florida Times-Union).