The Case of the Cryptic Crinoline and The Case of the Gypsy Goodbye by Nancy Springer are the final two books in the Enola Holmes mystery series.
these two books, Enola solves the mystery of her landlady's
disappearance, which is strangely related to Florence Nightingale,
rescues a kidnapped lady, and discovers the truth of her mother's
disappearance. As with the rest of the series, I listened to these on
audiobook, and of course Katherine Kellgren's narration did not
disappoint. Audiobook listeners, especially those who enjoy this sort of
story, should definitely take a look at this series!
(Reviewed from audiobooks borrowed through my library system.)