
After the death of a beloved character at the end of Book 3, The Burning Maze, there's more bloodshed to come in The Tyrant's Tomb. A lot is thrown at readers in the way of ancient history, Roman terms, and Greek and Roman characters, so thank goodness for the 16-page glossary at the end of the book. And, for extra credit, reading the Apollo chapter in Percy Jackson's Greek Gods helps when our "suddenly mortal and very unhappy about it" narrator, Apollo, recounts key moments of his godly life. The storyline picks up after the war at the end of the Heroes of Olympus, and many old favorite characters make cameos or are mentioned, like Frank, Hazel, and Reyna. It helps to read them both before digging into the Trials of Apollo series.

The Percy Jackson and the Olympians series came first, then the Heroes of Olympus. Parents need to know that The Tyrant's Tomb is the fourth book in a series that's a spin-off of a Percy Jackson spin-off series.
