In San Francisco, well-known sportsman, adventurer and traveller Kay Hoog announces to his club that he has found a message in a bottle with a map drawn by a Harvard professor who has gone missing.

Eventually the hunt brings Kay Hoog to England, where the Spiders kidnap Ellen, daughter of diamond king Terry whom they suspect of owning the stone.

Lio Sha and her henchmen catch up with Hoog in the cave where the pirate treasure is hidden and take him prisoner.

Back in England, he works with the police and Terry to free Ellen from the clutches of the Spiders' hypnotist master.

[2] Fritz Lang was early in his directorial career when he accepted an assignment to direct what was to be a mystery-action film series composed of four feature-length episodes.

Lang was forced by this assignment to relinquish the directorial duties of The Cabinet of Dr. Caligari, which was also released by the distributor Decla-Bioscop AG in 1919.

[1][2] Planned, but not produced (working titles): The Spiders was considered to be a lost film for many years before an original print was discovered in the 1970s.

The three-year reconstruction was done by film historians David and Kimberly Shepard,[5] with music scored by Gaylord Carter.