Under Pressure with a Squash: The Multiplication Problem

A Spy Among the Girls

Percy Jackson and the Sea of Monsters (Book 2)

Percy Jackson and the Lightning Thief (Book 1)

Percy Jackson and the Last Olympian (Book 5)

Percy Jackson and the Titan's Curse (Book 3)

The Ruins of Gorlan (Ranger's Apprentice Book 1 )

Percy Jackson and the Battle of the Labyrinth (Book 4)

The Blood of Olympus (Heroes of Olympus Book 5)

The House of Hades (Heroes of Olympus Book 4)

The Mark of Athena (Heroes of Olympus Book 3)

The Tower of Nero (The Trials of Apollo Book 5)

The Burning Bridge (Ranger's Apprentice Book 2)

The Son of Neptune (Heroes of Olympus Book 2)

The Icebound Land (Ranger's Apprentice Book 3)