This film is believed to be lost.
One of the last (if not the last) silent serials made by Nat Levine's Mascot Pictures Corp. The economy-minded Levine skimped on this 10-chapter production in preparation for the far more expensive talkie serial, The King of the Kongo (1929), which would be released about 6 months later.
Episode titles:
1. The Fatal Warning
2. The Phantom Flyer
3. The Crash of Doom
4. The Pit of Death
5. Menacing Fingers
6. Into Thin Air
7. The House of Horror
8. Fatal Fumes
9. By Whose Hand
10. Unmasked