The Rogue Emperor (A Riordanverse Story)

After the Trials of Apollo, Hazel is sent on a quest to seek out any additional emperors that New Rome doesn't know about that could stir up trouble. Everything is going well until Frank stops getting updates from the quest and only get worse when the rescue team of Hunters disappear as well. Frank asks Reyna, Nico, and Will for assistance in locating their friends that sends them down a wild ride with two morally grey companions.
Mixed with a bit of fun Roman history and trivia, the story is similar to those included in the Demigod Files or Demigod Diaries. Told from the perspectives of Frank, Reyna, and Nico, each chapter has two parts to enjoy!
There a notes in each chapter at the end with numbers corresponding in the text to answer translations of words and interesting historical facts, people, places, and events, with it all compiled into one place at the last 'chapter' of the story.