Daughter of the Deep

Daughter of the Deep is a middle grade fantasy-adventure novel by Rick Riordan. The book was published on October 26, 2021, by Disney-Hyperion. The book is a New York Times best seller. Unlike Riordan's earlier books which dealt with mythology, Daughter of the Deep is a Retrofuturism science fiction novel set in a contemporary timeline of the world of Jules Verne's books Twenty Thousand Leagues Under the Seas and The Mysterious Island. This is a derivative work, featuring machinery, tools and settings described in Verne's books, and characters who are descendants of Verne's characters. It combines both old and future technologies, melding together elements of both steampunk and artificial intelligence. The book incorporates the tropes of sibling rivalry and the recovery of lost ancient technologies. For example, Nemo's Nautilus – now under the control of his descendants – is described as having artificial intelligence and being capable of travel via supercavitation.

The book follows Ana Dakkar, who is a student at Harding-Pencroft Academy. She learns that at the end of her freshman year, her class will be taken on a top secret weekend trial at sea. The book was inspired by Jules Verne's 20,000 Leagues Under the Seas.