Agatha webb

As a convivial group leaves a dance one night a young man rushes by muttering Thank God, this night of horror is over... and soon therafter cries of alert the group that Agatha Webb has been stabbed to death! A saintly woman is found stabbed, with her husband, a dementia victim, found asleep with blood on his sleeve; her housekeeper is dead, too. The reprobate son of the town's first citizen acts suspicious; his girlfriend is blackmailing him. Witnesses saw a strange, bearded old man.