Secrets of Droon #4: The City in the Clouds

#1 · The Hidden Stairs and the Magic Carpet (The Secrets of Droon #1): The Hidden Stairs And The Magic Carpet #2 · Journey to the Volcano Palace (The Secrets of Droon #2): Journey To The Volcano Palace #4 · Secrets of Droon #4: The City in the Clouds #6 · Secrets of Droon #6: The Sleeping Giant of Goll #9 · Secrets of Droon #9: The Tower of the Elf King #11 · Secrets of Droon #11: The Hawk Bandits of Tarkoom #12 · Secrets of Droon #12: Under the Serpent Sea #13 · Secrets of Droon #13: The Mask of Maliban #14 · Secrets of Droon #14: Voyage of the Jaffa Wind #17 · Secrets of Droon #17: The Dream Thief #20 · Secrets of Droon #20: In the Caves of Krog #27 · Secrets of Droon #27: The Chariot of Queen Zara #31 · Secrets of Droon #31: Queen of Thorns #33 · Secrets of Droon #33: Flight of the Blue Serpent #35 · Secrets of Droon #35: The Lost Empire of Koomba