There are 6 books in the Nell Sweeney Mystery Series series. The newest book is A Bucket of Ashes which came out in 2007.

“What a thoroughly charming book! A beautiful combination of entertaining characters, minute historical research, and a powerful evocation of time and place.” —NYT bestselling author Barbara Hambly

Boston, 1868: The dawn of the Gilded Age, an era of burgeoning commerce and invention, of unimaginable new fortunes and lavish excess—for some.…
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2
Murder in a Mill Town

Book cover of Murder in a Mill Town
For Nell, tracing the path of a missing woman through the seedy parts of 1868 Boston just may be the death of her.

3
Death on Beacon Hill

Book cover of Death on Beacon Hill
“Death on Beacon Hill continues Ms. Ryan’s excellent Nell Sweeney series. The rich characterization and her strong evocation of place, coupled with a well-plotted tale, make for a rich story. Add a clever conclusion and Ms. Ryan delivers a fascinating read.” —Fresh Fiction

Boston, 1869: As governess to the wealthy…

4
Murder on Black Friday

Book cover of Murder on Black Friday
When Wall Street's first "Black Friday" leads to the demise of two acquantances of her employers, governess Nell Sweeney and Dr. Will Hewitt discover that the cause of death was not suicide but murder. Original.

5
Murder in the North End

Book cover of Murder in the North End
When her friend, an Irish police officer, goes on the lam after being accused of killing a petty criminal in Boston's North End, Nell Sweeney, a governess for a wealthy family, journeys into a dark underworld of crime and corruption to prove his innocence with the help of her employer.…

6
A Bucket of Ashes

Book cover of A Bucket of Ashes
From the Mary Higgins Clark Award nominee-a new Gilded Age mystery.

Nell's reputation as a model governess is threatened by a secret from her past-and the possibility that she might be carrying Will Hewitt's child. But these problems pale with what she learns: that the body of her only remaining…