Murder!

Summoned for jury duty, Sir John is one of 12 people who must decide the fate of Diana Baring (Norah Baring), a young actress on trial for murder. Though the girl is found guilty, Sir John believes that she's innocent and sets about to prove it on his own, exercising his actor's prerogative of adopting clever disguises in the course of his investigation. Along the way, he is obliged to entertain a pair of lower-class clods, Ted and Dulcie Markham (Edward Chapman and Phyllis Konstam), who help him stage an elaborate re-enactment of the crime.