The Underland Chronicles Book Five: Gregor and the Code of Claw

The Underland Chronicles Book Three: Gregor and the Curse of the Warmbloods

The Underland Chronicles Book Two: Gregor and the Prophecy of Bane

The Underland Chronicles Book One: Gregor the Overlander

Erak's Ransom: Book Seven

The Siege of Macindaw: Book Six

The Sorcerer of the North: Book Five

The Heroes of Olympus, Book Three: The Mark of Athena