I haven't yet read this, but from the excerpt it appears that this books isn't a sequel from 20,000 Leagues Under the Sea, but the 3rd installment of The Mysterious Island triad, the first being "The Mysterious Island" and the second is "Abandoned".
When A.W. Exley isn't deciphering hieroglyphs or riding her horse sidesaddle, she is thinking up plots for her next best-seller. Nefertiti's Heart is a beautiful mixture of all Exley's passions in life, set in a Steampunk society, featuring a very Egyptian theme. As our Author of the Day, she chats with us about her fascination with Egypt, why she picked an alternate universe for Nefertiti and how she shaped the book.