
Plotline:
A mysterious villain who calls himself The Dragon is attempting to prevent International Airways from beginning service in Mongolia, in order to protect the secret of the mountain of jade for himself. It features a dungeon in the nearby monastery, the kidnapping of an archeologist who stumbles onto the secret, his daughter’s attempts to rescue him with Ace’s help, a death ray The Dragon uses on the airline pilots, a radio system by which The Dragon communicates with his henchmen via the rotation of Buddhist prayer wheels (each transmission concluding “The Dragon commands!”), and a squadron of his own fighter planes.
Chapter titles:
Chapter 1 – Where East Meets West
Chapter 2 – The Invisible Enemy
Chapter 3 – The Doorway of Doom
Chapter 4 – The Radio Riddle
Chapter 5 – Bullets of Sand
Chapter 6 – Evil Spirits
Chapter 7 – The Trackless Trail
Chapter 8 – The Sign in the Sky
Chapter 9 – Secret Service
Chapter 10 – The Mountain of Jade
Chapter 11 – The Dragon Commands
Chapter 12 – The Squadron of Death
Chapter 13 – The World’s Akin
By Ford Beebe / Clifford Smith (https://archive.org/details/ace_drummond1) [Public domain], via Wikimedia Commons
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