Murder Most Foul (1965)

Miss Marple forces a hung jury by being the single juror to have enough reasonable doubt about the accused. The suspect was found in the same room with a hanged woman, fiddling with the rope. Before the next trial can be scheduled, she's off to solve the crime by going undercover as a thespian with a small theater troupe in which the deceased had particular interest.

It's a very slight -- and occasionally silly -- little mystery.

B-