There are 3 books in the The Extraordinary Adventures of the Athena Club series. The newest book is The Sinister Mystery of the Mesmerizing Girl which came out in 2019.

1
The Strange Case of the Alchemist's Daughter

Book cover of The Strange Case of the Alchemist's Daughter
Based on some of literature's horror and science fiction classics, this "tour de force of reclaiming the narrative, executed with impressive wit and insight" (Publishers Weekly, starred review) debut is the story of a remarkable group of women who come together to solve the mystery of a series of gruesome…
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2
European Travel for the Monstrous Gentlewoman

Book cover of European Travel for the Monstrous Gentlewoman
In the sequel to the critically acclaimed The Strange Case of the Alchemist's Daughter, Mary Jekyll and the rest of the daughters of literature's mad scientists embark on a madcap adventure across Europe to rescue another monstrous girl and stop the Alchemical Society's nefarious plans once and for all.

Mary…

3
The Sinister Mystery of the Mesmerizing Girl

Book cover of The Sinister Mystery of the Mesmerizing Girl
Mary Jekyll and the Athena Club race to save Alice-and foil a plot to unseat the Queen, in the electrifying conclusion to the trilogy that began with the Nebula Award finalist and Locus Award winner The Strange Case of the Alchemist's Daughter.

Life's always an adventure for the Athena Club...especially…