The Trail of the Octopus (1919) is a Mystery, Thriller, Action film that follows carter Holmes, master criminologist, must help the oft-kidnapped Ruth Stanhope to find the 9 daggers that will unlock the secret of the cursed Devil's Trademark! Currently, you can watch The Trail of the Octopus on Amazon Video. Streaming availability may vary by country and platform over time. It has a user rating of 7.5 out of 10 from 2 votes. Fans of mystery movies may also want to explore similar titles below.