Twelve people turn up at a dark house on a stormy night one by one, let in by a butler (who has tied up the real one!) We discover that these twelve people know each other, they were the jurors on a trial which apparently sent an innocent man to the gallows. They have been gathered together by Hale Hamilton to demonstrate how someone can be wrongly convicted on circumstantial evidence, a murder is staged but is everything actually fake?
The idea of this film is good but it can be a hard going watch at times. Most of the characters have less dimensions than a piece of string and the dialogue is pretty weak at times. However, this does have all the tropes of a Golden Age dark house mystery including hidden passages and female screams on cue! Not the worst film but it could have been a lot better.