The Underland Chronicles Book Four: Gregor and the Marks of Secret

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

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

The Underland Chronicles Book One: Gregor the Overlander

The Siege of Macindaw: Book Six

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