After the publications of "Twenty Thousand Leagues Under the Sea" and "The Mysterious Island," the world is now familiar with Captain Nemo's history - and the details of his demise. Doctor Grace Evans, an English doctor living in colonial India, discovers that Captain Nemo is still alive and that the Nautilus, his infamous vessel of revenge, still lurks in the depths of the ocean. Seizing an opportunity to fulfil her passion for scientific exploration, Grace blackmails Nemo into taking her aboard. She becomes inextricably entangled in the ongoing saga of the Nautilus crew as she joins Nemo on an expedition to the sunken city of Dwarka. Little does she know this expedition is a part of a bigger plan to avenge Captain Nemo's murdered family once and for all. As Grace and Nemo's alliance is tested, their darkest secrets are brought to light, and their fates become intertwined.