I don't think I posted this before. At any rate, here is the cover copy for What Darkness Brings, book number eight in the Sebastian St. Cyr series.
The death of a notorious London diamond merchant draws aristocratic investigator Sebastian St. Cyr and his new wife Hero into a sordid world of greed, desperation, and the occult, when the husband of Sebastian’s former lover Kat Boleyn is accused of the 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 a year ago, has been found standing over the corpse of Benjamin Eisler, a powerful 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.
As the killer grows ever more desperate and vicious, Sebastian finds his still-new marriage to Hero tested by his loyalty to his first love, especially when Sebastian begins to suspect that Kat is keeping secrets of her own. And when matters reach a crisis, Sebastian must face a bitter truth—that he has been less than honest with the calm, fearless woman who is now his wife.