The Griffin Gate

Harley Hitch and the Iron Forest

Percy Jackson and the Lightning Thief (Book 1)

The Puffin Portal

Firesong

Percy Jackson and the Sea of Monsters (Book 2)

Serpent of the Sands

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

Percy Jackson and the Last Olympian (Book 5)

His Dark Materials: The Amber Spyglass (Book 3)

Harley Hitch and the Missing Moon

The House of Hades (Heroes of Olympus Book 4)

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

Darkwhispers

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

Harley Hitch and the Fossil Mystery

The Mark of Athena (Heroes of Olympus Book 3)