Castle Sinister (1948) is a Horror, Thriller film that follows during the War, a British agent travels to the remote Glennye Castle in the wilds of Scotland to investigate a mysterious murder by a masked phantom. Who or what is the phantom? And how are the Germans involved? Currently, you can watch Castle Sinister on Amazon Video, Google Play Movies, YouTube. Streaming availability may vary by country and platform over time. It has a user rating of 3.4 out of 10 from 10 votes. Fans of horror movies may also want to explore similar titles below.