WHAT THE DEVIL KNOWS by C.S. Harris

Sebastian St. Cyr thought a notorious serial 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?


Title : What The Devil Knows
Author : C.S. Harris
Series : Sebastian St. Cyr (book sixteen)
Format : eARC
Page Count : 336
Genre : historical fiction / crime mystery
Publisher : Berkley Books
Release Date : April 6, 2021

Reviewer : Hollis
Rating : ★ ★ ★ .5


Hollis’ 3.5 star review

I’m rather tempted to round up on this one, at which point this intro will be deleted, but for now (or for good), I am a little hesitant. I don’t know if I’m thinking more fondly of this experience because it’s been a year since the last installment, around the same time I binged like.. fourteen of these back to back (which was just too much), or because it was just a little better than the last few.

We had a few moments of what I refer to as “copy paste” scenes which Harris seems to include in all her books but overall, much like the last book, there were quite a few less than usual. I was delighted.

The murder mystery itself was.. kind of all over the place. In the sense that there were so many pieces and moving parts and you really don’t see the big picture until the end. I both love and hate these kind of mysteries because I find the complexity very artful but it also means that if you aren’t being compelled by the new clues, you’re just sorta being dragged along. Which wasn’t quite the case here but it was close.

What saved said mystery from feeling too out of place from too many pieces of the puzzle were some familiar, and new, faces that tie into Sebastian’s personal life. I was curious why we were reunited with a few of them but oh you understand why come the end. I can’t say I totally saw that coming but neither was it a complete surprise. There was another event that finally came to pass that I think means we might finally be building up to something else (why am I even expanding on these vagueries..) that has been brewing for, I swear, like four or five books now. When is that confrontation going to happen! Will it ever! Why do I ask the same rhetorical questions in every review for this series! I’m not mad I’m just making a point about my own ridiculousness.

Much like some other series I’m keeping up with, I wonder how many more are still to come in the Sebastian St Cyr series. However unlike those other series, I’m not currently mad about this one.. well, continuing on. Despite some of the rehashing and a new murder mystery of the week duds, somehow, I’m still looking forward to more. Maybe because I just want to payoff of everything that we’ve come to expect will (one day) be revealed. Any hints on when that might be, Harris..? No? Cool. Cool cool cool cool cool. See you next year.

** I received an ARC from NetGalley and the publisher (thank you!) in exchange for an honest review. **

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