The mute of Portici
During a test run for a large race in Sicily the racing car driver Bettina Bang gets into an accident and is saved by a secretive person unknown to her. It later turns out that the unknown man is the race car driver Harry Bredow.
Elisabeth is subject of a girl's boarding school run by the nuns. The village idiot Michele adores her and is particularly drawn to her organ playing. In his madness, he kills the girl's father and tries to lay the blame on the organist.