City in the Clouds (The Secrets of Droon #4)
The Sleeping Giant Of Goll (The Secrets Of Droon #6)
The Mysterious Island (Secrets of Droon #3)
Journey to the Volcano Palace (The Secrets of Droon, Book 2)
The Secrets of Droon #7: Into the Land of the Lost
The Golden Wasp (The Secrets of Droon, 8)
The Hidden Stairs and the Magic Carpet (The Secrets of Droon, Book 1)
The Secrets of Droon #9: The Tower of the Elf King
Quest for the Queen (Secrets of Droon #10)
The Secrets of Droon #12: Under the Serpent Sea