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What the Devil Knows

(Book 16 in the Sebastian St. Cyr Mystery series)
A novel by

Sebastian St. Cyr thought a notorious killer had been brought to justice until a shocking series of gruesome new murders stuns the city in this thrilling historical mystery from the USA Today bestselling author of Who Speaks for the Damned.

It's October 1814. The war with France is finally over and Europe's diplomats are convening in Vienna for a conference that will put their world back together. With peace finally at hand, London suddenly finds itself in the grip of a series of heinous murders eerily similar to the Ratcliffe Highway murders of three years before. 

In 1811, two entire families were viciously murdered in their homes. A suspect--a young seaman named John Williams--was arrested. But before he could be brought to trial, Williams hanged himself in his cell. The murders ceased, and London slowly began to breathe easier. But when the lead investigator, Sir Edwin Pym, is killed in the same brutal way three years later and others possibly connected to the original case meet violent ends, the city is paralyzed with terror once more. 

Was the wrong man arrested for the murders? Bow Street magistrate Sir Henry Lovejoy turns to his friend Sebastian St. Cyr, Viscount Devlin, for assistance. Pym's colleagues are convinced his manner of death is a coincidence, but Sebastian has his doubts. The more he looks into the three-year-old murders, the more certain he becomes that the hapless John Williams was not the real killer. Which begs the question--who was and why are they dead set on killing again?

Genre: Historical Mystery

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Hardback Editions

April 2021 : USA Hardback

Title: What the Devil Knows (Sebastian St. Cyr Mystery)
Author(s): C S Harris
ISBN: 0-593-10266-5 / 978-0-593-10266-4 (USA edition)
Publisher: Berkley
Availability: Amazon   Amazon UK   Amazon CA   

Audio Editions

April 2021 : USA Audio edition

Title: What the Devil Knows: Sebastian St. Cyr Mysteries, Book 16
Author(s): C S Harris
Publisher: Recorded Books, Inc.
Availability: Amazon   

Kindle Editions

April 2021 : USA, Australia, Canada, UK Kindle edition

Title: What the Devil Knows (Sebastian St. Cyr Mystery Book 16)
Author(s): C S Harris
Publisher: Berkley
Availability: Amazon   Amazon UK   Amazon CA   Amazon AU