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Sebastian St. Cyr #21

When the Wolves Are Silent

Not yet published
Expected 14 Apr 26
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A brutal string of ritualistic killings terrorizes a city already shaken by economic and political turmoil in this chilling new historical mystery from C. S. Harris, USA Today bestselling author of Who Will Remember.

London, 1816: When a notorious young aristocrat is burned alive on a windswept hill popular with neo-Druids, former cavalry officer Sebastian St. Cyr, Viscount Devlin, finds himself plunged into a murder investigation shadowed by tales of ancient human sacrifices and long-buried secrets.

The victim, Marcus Toole, was the only son and heir of a prominent nobleman. His closest friend—Sebastian’s own nephew, Bayard—claims to have passed out drunk before the attack and remembers nothing. But when Sebastian and his brilliant wife, Hero, delve deeper into the sordid activities of Bayard and his friends, they come to realize that Bayard may not be as innocent as he pretends. Following a tangled trail that leads from a disaffected former soldier-turned-highwayman to a beautiful, courageous journalist and a Jamaican-born fencing master with ties to a radical political movement, Sebastian begins to suspect that Bayard and his friends are being targeting in revenge, by victims who believe they have no other recourse.

Then two more of Bayard’s friends are killed, their murders staged to echo the ritual sacrifices of the ancient Celts. With the palace shaken by the fear of riots and one horrifying death following another, Sebastian must race to stop a ruthless plot that threatens the lives of innocents and could rip his troubled nation apart.

400 pages, Hardcover

Expected publication April 14, 2026

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About the author

C.S. Harris

23 books3,024 followers
Candice Proctor, aka C.S. Harris and C.S. Graham, is the bestselling, award-winning author of more than a dozen novels including the Sebastian St. Cyr Regency mystery series written under the name C.S. Harris, the new C.S. Graham thriller series co-written with Steven Harris, and seven historical romances. She is also the author of a nonfiction historical study of the French Revolution. Her books are available worldwide and have been translated into over twenty different languages.

Candice graduated Phi Beta Kappa, summa cum laude with a degree in Classics before going on to earn an MA and Ph.D. in history. A former academic, she has taught at the University of Idaho and Midwestern State University in Texas. She also worked as an archaeologist on a variety of sites including a Hudson's Bay Company Fort in San Juan Island, a Cherokee village in Tennessee, a prehistoric kill site in Victoria, Australia, and a Roman cemetery and medieval manor house in Winchester, England. Most recently, she spent many years as a partner in an international business consulting firm.

The daughter of a career Air Force officer and university professor, Proctor loves to travel and has spent much of her life abroad. She has lived in Spain, Greece, England, France, Jordan, and Australia. She now makes her home in New Orleans, Louisiana, with her husband, retired Army officer Steve Harris, her two daughters, and an ever-expanding number of cats.

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Displaying 1 - 6 of 6 reviews
Profile Image for Laura Hill.
995 reviews84 followers
November 26, 2025
Thank you to Berkley House and NetGalley for providing an advance copy of this book in exchange for my honest review. The book will be published on April 14th, 2026.

Number 21 in the Sebastian St. Cyr historical mystery series. Regency period — 1816 — London and environs. This was the “year without a summer” due to the eruption of Mount Tambora in 1815.

Sebastian — son and heir to an Earl — has a habit of involving himself in bringing justice to murder victims, regardless of their class. In this episode, first one and then another of a group of high born friends is murdered — one found in the river and the other burned to death. One of the group is Sebastian’s nephew Bayard. The entire group — Bayard definitely included — is what are known as “bad ton” where “ton” refers to the state of being fashionable and high society. The men in this group feel they are above any law or sense of human decency.

In solving the evolving mystery (more bodies turn up) there is reference to the American wars, the slave trade, ancient Celtic practices including human sacrifice, and potential Druid revivals. I always thought of Celts as ancient Britons but learned recently that in fact Celtic tribes were roaming around Central Europe as early as 1200 BCE. and as for Druids, I found this note in the book interesting: “Actually as far as we can tell, the Druids were more like what we might call the intellectual class of the ancient celts. The poets, historians, musicians, physicians, and astronomers of their day and advisors to Kings.”

The writing is decent, the characters (from the high to the medium and low) have evolved over time and have depth, and the mystery was quite convoluted, but completely consistent and engaging.

As an aside, the author’s note at the end of these books is always illuminating as she clearly delineates the fact from the fiction. I was particularly interested in a “real” character — German chemist Friedrich Accum who, among his other many accomplishments, was one of the first to draw attention to the danger of food additives and was involved in gaining acceptance for beet sugar, which was notable for *not* being derived from slave-driven sugar production from cane.
Profile Image for Debbie.
3,639 reviews88 followers
Review of advance copy received from Netgalley
December 18, 2025
"When the Wolves Are Silent" is a mystery set in 1816 in London. This book is the 21th in a series, but you can understand it without having read the previous novels. Interesting historical information was woven into the story without slowing the pacing. Vivid details created a distinct feeling of that specific time and place and helped bring the story alive in my imagination.

The characters were interesting, complex, and acted in realistic ways. Sebastian questioned suspects and witnesses, and Hero also helped gather information by questioning some people. Sebastian tracked down leads, coming up with a lot of potential motives before finally narrowing things down. However, I'm still not quite sure how Sebastian became so certain of whodunit, but he promptly acted to save the next victim even as they're attacked, which rather confirmed it.

There were no sex scenes. There was a fair amount of bad language. Overall, I'd recommend this interesting historical mystery.

I received an ebook review copy of this book from the publisher through NetGalley.
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