The Sun and the Star

From the World of Percy Jackson: The Sun and the Star: A Nico di Angelo Adventure, commonly known as The Sun and the Star, is a 2023 American children's fantasy action-adventure middle grade children's fiction novel based on Greco-Roman classical mythology co-written by American authors Rick Riordan and Mark Oshiro. The book is a sequel to the 2020 novel The Tower of Nero in The Trials of Apollo series, and is the first book in The Nico di Angelo Adventures series. The novel follows the demigods and heroes, Nico di Angelo and Will Solace, the sons of the Greek Gods Hades and Apollo, respectively, as the boys follow a prophecy on a quest into the deep dark abyss of Tartarus, underneath the Greek underworld, to rescue an old friend of the boys, commonly known as Bob, who is, in fact, the Greek Titan Iapetus.

The Sun and the Star was originally published in American English by Disney-Hyperion in the United States and in British English by Puffin Books in the United Kingdom. The English language version novel was released on May 2, 2023, and immediately became the number one bestseller on The New York Times Best Seller list for Children’s Middle Grade books, the American Booksellers Association IndieBound Best Seller List for Early & Middle Grade Readers, the Publishers Weekly Best Seller List for Children's Fiction, and The Globe and Mail Bestseller List for Juvenile books. The book was listed on The New York Times Best Seller list for Children’s Middle Grade books for a total of 73 weeks, the American Booksellers Association IndieBound Best Seller List for Early & Middle Grade Readers for a total of 44 weeks, the Publishers Weekly Best Seller List for Children's Fiction for a total of 33 weeks, and The Globe and Mail Bestseller List for Juvenile books for a total of 9 weeks. The book was the number one overall bestseller on the American Booksellers Association IndieBound Best Seller List for Early & Middle Grade Readers for the entire year of 2023.

The Sun and the Star was awarded the Common Sense Selection Seal for Families by Common Sense Media, listed as a Best Middle-Grade Fantasy of 2023 by Kirkus Reviews, and either simultaneously or subsequently translated into sixteen different languages. The Sun and the Star was originally intended to be a standalone book, but the success of the novel led to the announcement of a sequel, The Court of the Dead, which is the second book in The Nico di Angelo Adventures series, which was released on September 23, 2025.