Directed by Ford Beebe and Clifford Smith

Cast: John 'Dusty' King .... Ace Drummond Jean Rogers .... Peggy Trainor Noah Beery Jr. .... Jerry Guy Bates Post .... The Grand Lama Lon Chaney Jr. .... Henchman Ivan Jackie Morrow .... Billy Meredith Selmer Jackson .... William Meredith, Sr. Robert Warwick .... Winston James B. Leong .... Henry Kee Chester Gan .... Kai-Chek Arthur Loft .... Chang-Ho, The Dragon

This 13 chapter serial is based on the comic strip character Ace Drummond created by Eddie Rickenbacker. Ace is a 'G-Man of the sky' working out of Washington D.C. He is sent to Mongolia to find out why a mysterious villain known only as “The Dragon” is trying to prevent the newly formed International Airways from setting up an airport there. Ace meets Peggy Trainor (Jean Rogers) who is searching for her archaeologist father who has disappeared. Together they search for answers to the puzzles.

Chapter titles

Where East meets West

The Invisible Enemy

The Doorway of Doom

The Radio Riddle

Bullets of Sand

Evil Spirits

The Trackless Trail

The Sign in the Sky

Secret Service

The Mountain of Jade

The Dragon Commands

The Squadron of Death

The Worlds Akin