The Secrets of Droon: Volume 2: #4:City in the Clouds; #5:The Great Ice Battle; #6:The Sleeping Giant of Goll

The Secrets of Droon #1: The Hidden Stairs and The Magic Carpet

Journey to the Volcano Palace: The Secrets of Droon Book 2

The Secrets of Droon #4: City In the Clouds

The Secrets of Droon #5: The Great Ice Battle

The Secrets of Droon: Volume 1: #1:The Hidden Stairs and the Magic Carpet; #2:Journey to the Volcano Palace; #3:The Mysterious Island

The Mysterious Island, The Secrets of Droon Book 3

The Secrets of Droon #6: The Sleeping Giant of Goll

The Serpent’s Curse

The Copernicus Legacy: The Golden Vendetta

The Copernicus Archives #2: Becca and the Prisoner's Cross

The Forbidden Stone