There are 7 books in the The Brothers Sinister series. The newest book is Talk Sweetly to Me which came out in 2022.

1
The Governess Affair

Book cover of The Governess Affair
The start of a critically acclaimed historical romance series by New York Times bestselling author Courtney Milan... Hugo Marshall earned the nickname "the Wolf of Clermont" for his ruthless ambition--a characteristic that has served him well, elevating the coal miner's son to the right hand man of a duke. When…
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2
The Duchess War

Book cover of The Duchess War
Miss Minerva Lane is a quiet, bespectacled wallflower, and she wants to keep it that way. After all, the last time she was the center of attention, it ended badly--so badly that she changed her name to escape her scandalous past. Wallflowers may not be the prettiest of blooms, but…

3
A Kiss for Midwinter

Book cover of A Kiss for Midwinter
Miss Lydia Charingford is always cheerful, and never more so than at Christmas time. But no matter how hard she smiles, she can't forget the youthful mistake that could have ruined her reputation. Even though the worst of her indiscretion was kept secret, one other person knows the truth of…
Miss Jane Fairfield has made a career of social disaster. She wears outrageous gowns and says even more outrageous things. The only reason she's invited anywhere is because of her immense dowry--which is all part of her plan to avoid marriage and keep the fortune-hunters at bay. Mr. Oliver Marshall…

5
The Countess Conspiracy

Book cover of The Countess Conspiracy
Sebastian Malheur is the most dangerous sort of rake: an educated one. When he's not scandalizing ladies in the bedchamber, he's outraging proper society with his scientific theories. He's desired, reviled, acclaimed, and despised--and he laughs through it all. Violet Waterfield, the widowed Countess of Cambury, on the other hand,…

6
The Suffragette Scandal

Book cover of The Suffragette Scandal
An idealistic suffragette... Miss Frederica "Free" Marshall has put her heart and soul into her newspaper, known for its outspoken support of women's rights. Naturally, her enemies are intent on destroying her business and silencing her for good. Free refuses to be at the end of her rope...but she needs…

7
Talk Sweetly to Me

Book cover of Talk Sweetly to Me
Nobody knows who Miss Rose Sweetly is, and she prefers it that way. She’s a shy, mathematically-minded shopkeeper’s daughter who dreams of the stars. Women like her only ever come to attention through scandal. She’ll take obscurity, thank you very much. All of England knows who Stephen Shaughnessy is. He’s…