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Publisher's Summary

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 best-selling 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?

©2021 C.S. Harris (P)2021 Recorded Books

What listeners say about What the Devil Knows

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Excellent story and performance.

The Sabastian St. Cry story are riveting and I enjoy the Author's Notes with the historical explanations. Davina Porter gives each character their own flair in these stories that adds to the discription given by C S Harris.
Enjoyed it.

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plot twists galore

very good listen. she gives you just enough clues to keep you hanging. Ms Porter does an amazing job of bringing characters to life

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Great series

I’ve enjoyed the entire Sebastian St Cyr series. I love the twists and turns.
Davina Porter is hands down my favourite narrator

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  • SophiaMarie
  • 2021-06-07

Lots of characters and. names to keep up wih

If you are listening to this book an hour at a time, try to write down who the characters are as they are introduced. I had to re- listen to parts several times, when I fell asleep listening. I listen at night often, so falling asleep is not a criticism of the story, just a reality.

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  • Amazon Customer
  • 2021-07-21

Excellent Read

Truly fascinating! I love the historical accuracy and details. I was captivated from beginning to end. I can’t wait for the next book in this series. The characters are so well rounded with depth and believably. Bravo!!

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  • A Customer
  • 2021-04-11

Recommend this historical police procedural series. Not a stand-alone.

I preorder audiobooks for this series, because I enjoy listening to Davina Porter, one of my favorite narrators, and as always Ms. Porter is superb.

This entry in the Sebastian St. Cyr Mysteries is excellent, but there are more characters than usual to keep track of. I worked to keep the many suspects straight in my mind—plus all the police functionaries and politicians. The domestic drama includes continuing angst about St. Cyr’s mother, half-brother, and others. His wife Hero’s dangerous father has his moments as the powerful shadow king, and as always, he’s protective of his only daughter and grandson.

Author C.S. Harris takes us to less salubrious areas of London, to meet many dodgy, disreputable people—who are wonderful red herrings. The storyline is labyrinthine, but at heart it’s a police procedural with numerous interrogations. The multiple murders are grisly, and victims range from an oldster to a baby. There are subtle clues and scene of crime “findings” that point toward the well-hidden culprit(s).

Recommend but suggest newbies not start here, because there’s not enough info about previously introduced characters, background, and ongoing story arcs.

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  • ZeraGirl
  • 2021-04-11

slow but good

For a highly anticipated St. Cyr book , in the excitement department it was a let down, for me that is. Sebastian does get into his usual brushes with death but the whole storyline came off a bit dull for me plus there were way too many characters to keep up with. The very, very surprise ending and Lord Jarvis and cousin Victoria were what made up for my lack of enthusiasm over this book. Harris redeemed herself with me for those two tidbits alone. Overall a good book, not a great one, but I still enjoyed it. The next St. Cyr adventure can't come soon enough.

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  • W.
  • 2022-07-04

Engrossing

Another highly interesting and entertaining Sebastian St Cyr book.

Davina Porter narration was great as well.

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  • Lori Dykes
  • 2022-06-21

Complicated

Another great addition! Complicated plot or at least to me! Again learning so much of history during this time and so much is heartbreaking.

A twist at the end that was unexpected but good. I just wonder when Hero will find out about what her father and new stepmother have been up to?

Please write faster! Lol

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  • BethG
  • 2022-04-14

Another fantastic Sebastian St. Cyr mystery!

This series deals very correctly with the history of the period while creating a believable and exciting work of fiction. Many thanks to Catherine Harris’s writing and Davina Porter’s masterful narration.

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  • Valentine
  • 2022-04-06

Bravo

Davina Porter is synonymous with the St. Cyr saga and “ What The Devil Knows” doesn’t disappoint.
However, I am saddened that Davina Porter is being replaced by Jenny Sterlin performing,” When Blood Lies”. Impossible to contemplate, having listened to samples of Jenny Sterlin’s voice. I’m so disappointed but I have decided to pre order a hard copy, rather than be unhappy with the Audible effort.
Books 1-16 will remain cherished listens and I shall continue to enjoy them.

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  • Kindle Customer
  • 2022-02-28

Fabulous as Usual

I started listening to the Sebastian St. Cyr mystery series from the start because I absolutely love the way Ms. Porter reads the books, I'm addicted to listening to this series (even as I read it). Ms. Porter does an absolutely fantastic job. About 75% of the way through I was sure I had the answers and by the end, I was surprised yet again. I didn't see it coming and I loved it!

I can't wait for the next one to come. As long as they keep coming, I'll keep listening.

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  • Angela D. Hunt
  • 2021-12-27

Excellent story based on true events

Can't wait for book 17! Love all of the stories and especially love Davina Porter.