There are 4 books in the Irene Adler and Sherlock Holmes novels series. The newest book is Irene's Last Waltz which came out in 1994.

1
Good Night, Mr. Holmes

Book cover of Good Night, Mr. Holmes

Winner of the American Mystery Award for Best Novel of Romantic Suspense, and the Romantic Times Award for Best Historical Mystery

Miss Irene Adler, the beautiful American opera singer who once outwitted Sherlock Holmes, is also a superb detective, as Oscar Wilde and Bram Stoker can attest. Even Holmes himself…

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2
Good Morning, Irene

Good Morning, Irene
Sherlock Holmes' female counterpart, Irene Adler, is in Paris reading her own obituaries when a drowned sailor, recently fished from the Seine and who bears a mysterious tattoo, draws her into a new adventure

3
A Soul of Steel

Book cover of A Soul of Steel
In this delightful encore to "Good Night, Mr. Holmes", diva-turned-detective Irene Adler engages in a battle of wits with Sherlock Holmes. Irene and her confidante Nell Huxleigh run into a stranger suffering from poisoning who turns out to be Quentin Stanhope, who is acquainted with both Nell and Watson. When…

4
Irene's Last Waltz

Irene's Last Waltz
Irene Adler, the sexy and scandalous counterpart to Sherlock Holmes, confronts the King of Bohemia, her former lover and the one man who had nearly destroyed her, and turns to her sleuthing friends for help when the case becomes more than elementary