Twenty years ago three murders took place in a country house's guest room which was, of course, locked. Now the daughter of the house owner (Lionel Atwill), Irene (Gloria Stuart), has three potential suitors but cannot choose between them. Thomas (William Janney) has the idea that the three of them must spend the night in the cursed guest room. Thomas goes first and goes missing.
Then on the next night Frank (Onslow Stevens) takes his turn and is shot. There is also a mysterious stranger entering the house and suspicious actions by the staff. Finally, the police (Edward Arnold) is called in by Captain Brink (Paul Lucas)...
This is a remake of 1932 German film Geheimnis des blauen Zimmers and is an excellent crime drama. Although it has many of the familiar tropes of Locked Room and Dark House mysteries, this is very well done and has a superb twist.
