Episode titles: 1. Hidden Power 2. The Mutilated Hand 3. The Poisonous Tarantula 4. Plot of a Demon 5. The Haunted House 6. The Torture Chamber 7. Drops of Blood 8. The Time-Clock Bomb 9. The Crystal Globe 10. A Message from the Sky 11. The Half-Breed's Hatred 12. Aeroplane Accident 13. The Spy and the Submarine 14. Interrupted Nuptials 15. The Pay of Death 16. The Final Strand
The story of the same name by British author Louis Tracy was published serially in newspapers while the film was playing in theaters. It has never been published in book form.