The adventure truly begins for young Lumen, now that she's learned she's the granddaughter of the legendary Captain Nemo. But what of her long-missing father, Nemo's son? To learn the answer to his disappearance, Lumen and Nemo must both face heartbreak along with the peril of an amazing and deadly steam-powered palace. All this, as they uncover who's behind their current dangers... an evil mastermind intent on conquest.