This is a perfectly fine film of its type. Based on a play, so it's talky and restricted in action. The story is a mild situation comedy, nothing hilarious, but it's the plot twists that are the point. As good as any British mystery comedy of the time I think. A Hammer/Exclusive film, Anthony Hinds producer, and James Sangster assistant director. As said elsewhere, brother and sister inherit this large house. Brother is a writer who needs to make more money. He thinks by concocting a story that he killed his sister he will make a fortune. In parallel, there is treasure hidden in the house and the thieves are trying to get the two to leave the house by making it sound haunted. In the opening scene there is "someone at the door", who enters at night and starts making spooky noises. Don't get the idea that the writer goes to trial for murder and then is dramatically saved. It never goes to that point, the plot is wrapped up without anything like that. No story is published about him murdering his sister or anyone else.