A 1921 movie serial directed by J.P. McGowan. Chapters: 1. The Buccaneer's Bride 2. The Hornet's Nest 3. The Secret of the Sea 4. The Hidden Danger 5. The Bandit's Victim 6. The Escape 7. In Hiding 8. The Trap 9. Under Sentence 10. The Secret Cavern 11. Satan's Twin 12. The Lost Ring 13. The Cipher Key 14. The Midnight Attack 15. The Race for Life 16. The Crystal Lake 17. A Fight to the Finish 18. Hidden Treasure