Stone Heart

This novella serves as a prequel to the series and functions as an accessible entry point for new readers to understand the power dynamics and geography of the city of Olympus. While it provides helpful context for the world-building, it is not strictly required reading to follow the plots of the subsequent novels.

The events of this book take place chronologically before the first novel in the series, Neon Gods. It introduces the social structure of the Thirteen and the divide between the Upper and Lower City, which remain central themes throughout the later books.