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".
Jennette Green discovered a love for writing in the second grade. She had stories in her mind that were simply calling to be written. The Kaavl series is one such a story, which has been with her since she was eighteen. As our Author of the Day, Green reveals how many times she rewrote Kaavl Conspiracy, how her books come together and gives a sneak peek into what we can expect from her next.