Sun and the Star, The (From the World of Percy Jackson):by Rick Riordan, Mark Oshiro; 2023. Hardcover. (Ch-FIC)

The Sun and the Star is a 2023 fantasy novel by Rick Riordan and Mark Oshiro, focusing on Nico di Angelo and Will Solace as they journey into Tartarus to rescue the Titan Bob. It's a standalone adventure in the "World of Percy Jackson" universe, exploring themes of love, mental health, and hope as the couple faces challenges and tests their relationship in the depths of the Underworld. The book is a sequel to The Tower of Nero and the first in The Nico di Angelo Adventures series, and while it can be read alone, prior knowledge of The Trials of Apollo is recommended for full context.

Nico, the son of Hades, and his boyfriend Will, the son of Apollo, travel to Tartarus, the deepest, darkest part of the Underworld as they attempt to rescue an old friend.