Harley Hitch and the Iron Forest

Percy Jackson and the Lightning Thief (Book 1)

The Puffin Portal

Percy Jackson and the Sea of Monsters (Book 2)

Harley Hitch Takes Flight

Percy Jackson and the Last Olympian (Book 5)

Harley Hitch and the Fossil Mystery

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

The Griffin Gate

The Blood of Olympus (Heroes of Olympus Book 5)

Harley Hitch and the Missing Moon

His Dark Materials: The Amber Spyglass (Book 3)

The House of Hades (Heroes of Olympus Book 4)

Darkwhispers

The Mark of Athena (Heroes of Olympus Book 3)

The Weather Well

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

The Wee Free Men: (Discworld Novel 30)