The gruesome murder of a young French physician draws aristocratic investigator Sebastian St. Cyr and his pregnant wife, Hero, into a dangerous, decades-old mystery as a wrenching piece of Sebastian’s past puts him to the ultimate test. Regency England, January 1813: When a badly injured Frenchwoman is found beside the mutilated body of Dr. Damion Pelletan in one of London’s worst slums, Sebastian finds himself caught in a high-stakes tangle of murder and revenge. Although the woman, Alexi Sauvage, has no memory of the attack, Sebastian knows her all too well from an incident in his past—an act of wartime brutality and betrayal that nearly destroyed him. As the search for the killer leads Sebastian into a treacherous web of duplicity, he discovers that Pelletan was part of a secret delegation sent by Napoleon to investigate the possibility of peace with Britain. Despite his powerful father-in-law’s warnings, Sebastian plunges deep into the mystery of the “Lost Dauphin,” the boy prince who disappeared in the darkest days of the French Revolution, and soon finds himself at lethal odds with the Dauphin’s sister—the imperious, ruthless daughter of Marie Antoinette—who is determined to retake the French crown at any cost. With the murderer striking ever closer, Sebastian must battle new fears about Hero’s health and that of their soon-to-be born child. When he realizes the key to their survival may lie in the hands of an old enemy, he must finally face the truth about his own guilt in a past he has found too terrible to consider....

In this mystery in the Sebastian St. Cyr series, the aristocratic investigator is drawn into a sordid world of greed, desperation, and the occult when the husband of his former lover is accused of murder. Regency England, September 1812: After a long night spent dealing with the tragic death of a former military comrade, a heart-sick Sebastian learns of a new calamity: Russell Yates, the dashing, one-time privateer who married Kat Boleyn a year ago, has been found standing over the corpse of Benjamin Eisler, a wealthy gem dealer. Yates insists he is innocent, but he will surely hang unless Sebastian can unmask the real killer. For the sake of Kat, the woman he once loved and lost, Sebastian plunges into a treacherous circle of intrigue. Although Eisler’s clients included the Prince Regent and the Emperor Napoleon, he was a despicable man with many enemies and a number of dangerous, well-kept secrets—including a passion for arcane texts and black magic. Central to the case is a magnificent blue diamond, believed to have once formed part of the French crown jewels, which disappeared on the night of Eisler’s death. As Sebastian traces the diamond’s ownership, he uncovers links that implicate an eccentric, powerful financier named Hope and stretch back into the darkest days of the French Revolution. When the killer grows ever more desperate and vicious, Sebastian finds his new marriage to Hero tested by the shadows of his first love, especially when he begins to suspect that Kat is keeping secrets of her own. And as matters rise to a crisis, Sebastian must face a bitter truth—that he has been less than open with the fearless woman who is now his wife.

THE FIRST SEBASTIAN ST. CYR MYSTERY! “The combined elements of historical fiction, romance, and mystery in this fog-enshrouded London puzzler will appeal to fans of Anne Perry.”—Booklist It’s 1811, and the threat of revolution haunts the upper classes of King George III’s England. Then the body of a beautiful young woman is found savagely murdered on the altar steps of an ancient church near Westminster Abbey. A dueling pistol discovered at the scene and the damning testimony of a witness both point to one man: Sebastian St. Cyr, Viscount Devlin, a brilliant young nobleman shattered by his experiences in the Napoleonic Wars. Now a fugitive running for his life, Sebastian calls upon his skill as an officer during the war to catch the killer and prove his own innocence. In the process, he accumulates a band of unlikely allies, including the enigmatic beauty Kat Boleyn, who broke Sebastian’s heart years ago. In Sebastian’s world of intrigue and espionage, nothing is as it seems, yet the truth may hold the key to the future of the British monarchy, as well as to Sebastian’s own salvation....

Murder has jarred London’s elite. The sons of prominent families have been found at dawn in public places, partially butchered, with strange objects stuffed in their mouths. Once again, the local magistrate turns to Sebastian St. Cyr, Viscount Devlin, for help. Moving from the gritty world of London’s docks to the drawing rooms of Mayfair, Sebastian confronts his most puzzling—and disturbing—case yet.

When Gabrielle Tennyson is murdered, aristocratic investigator Sebastian St. Cyr and his new reluctant bride, the fiercely independent Hero Jarvis, find themselves involved in an intrigue concerning the myth of King Arthur, Camelot, and a future poet laureate...

Hero Jarvis, reform-minded daughter of the Prince Regent's cousin, enlists Sebastian St. Cyr's help in investigating the brutal murders of eight prostitutes. Following a trail of clues from London's seedy East End to the Mayfair mansions of a noble family, the two must race against time to stop a killer whose ominous plot threatens to shake the nation to its very core?

Sebastian St. Cyr, Viscount Devlin, has spent years unraveling his family’s tragic history. But the secrets of his past will come to light in this gripping new historical mystery from the USA Today bestselling author of What the Devil Knows. March, 1815. The Bourbon King Louis XVIII has been restored to the throne of France, Napoleon is in exile on the isle of Elba, and Sebastian St. Cyr, Viscount Devlin, and his wife, Hero, have traveled to Paris in hopes of tracing his long-lost mother, Sophie, the errant Countess of Hendon. But his search ends in tragedy when he comes upon the dying Countess in the wasteland at the tip of the Île de la Cité. Stabbed—apparently with a stiletto—and thrown from the bastions of the island’s ancient stone bridge, Sophie dies without naming her murderer. Sophie had been living in Paris under an assumed name as the mistress of Maréchal Alexandre McClellan, the scion of a noble Scottish Jacobite family that took refuge in France after the Forty-Five Rebellion. Once one of Napoleon’s most trusted and successful generals, McClellan has now sworn allegiance to the Bourbons and is serving in the delegation negotiating on behalf of France at the Congress of Vienna. It doesn’t take Sebastian long to realize that the French authorities have no interest in involving themselves in the murder of a notorious Englishwoman at such a delicate time. And so, grieving and shattered by his mother’s death, Sebastian takes it upon himself to hunt down her killer. But what he learns will not only shock him but could upend a hard-won world peace.