There are 5 books in the Rosalind Thorne Mystery series. The newest book is A Counterfeit Suitor which came out in 2021.

Inspired by the novels of Jane Austen, this new mystery series set in 19th-century London introduces the charming and resourceful Rosalind Thorne, a woman privy to the secrets of high society—including who among the ton is capable of murder...
 
The daughter of a baronet and minor heiress, Rosalind Thorne was…
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2
A Purely Private Matter

Book cover of A Purely Private Matter
The Rosalind Thorne Mysteries—inspired by the novels of Jane Austen—continue as the audacious Rosalind strives to aid those in need while navigating the halls of high society…

Rosalind Thorne has slowly but assuredly gained a reputation as “a useful woman”—by helping respectable women out of some less-than-respectable predicaments. 

Her latest…

3
And Dangerous to Know

Book cover of And Dangerous to Know
When the ladies of the ton of Regency London need discreet assistance, they turn to Rosalind Thorne—in these mysteries inspired by the novels of Jane Austen . . .
 
Trust is a delicate thing, and no one knows that better than Rosalind Thorne. Lady Melbourne has entrusted her with recovering…

4
A Lady Compromised

Book cover of A Lady Compromised
“Wilde's heroine is not only a useful woman but a highly entertaining one.”
—Kirkus Reviews on And Dangerous to Know
 
Fans of Jane Austen have fallen in love with Darcie Wilde's mystery series featuring Rosalind Thorne, a young woman adept at helping ladies of the ton navigate the darker corners…

5
A Counterfeit Suitor

Book cover of A Counterfeit Suitor
Among the ton of Regency London, one breath of scandal can be disastrous. Enter Rosalind Thorne in this charming mystery series inspired by the novels of Jane Austen and compared to a 19th century Phoebe Waller-Bridge from “Fleabag.” Charming and resourceful, she is a woman adept at helping ladies of…