There are 4 books in the Improper Liaisons series. The newest book is An Improper Duke which came out in 2024.

1
An Improper Proposition

Book cover of An Improper Proposition
Fraternizing with one's footman—no matter how young and handsome he is—is not the done thing. But Lady Wells is going to do it anyway...

Bianca, the widowed Countess of Wells, secretly lusts after her much younger, rakishly handsome footman Harry Blake. Even though he has been in her employ for…
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2
An Improper Governess

Book cover of An Improper Governess
Lusting after one's employer is certainly not the done thing when you are a governess. But Miss Abigail Adams cannot seem to help herself...

Abigail Adams, the resident governess of Hartfield Hall, might appear to be a very proper young woman, yet she secretly yearns for excitement to brighten her…

4
An Improper Duke

Book cover of An Improper Duke

Having an affair with a heart-stoppingly handsome, much younger duke is all kinds of improper...but when he's also your stepson's best friend, it's positively scandalous.

Bookish Celia Wyndham, the widowed Lady Ashdown, has been half in love—and shockingly in lust—with her stepson's best friend, Hugo Dehavilland, the very eligible Duke…