Francis, a young man, recalls in his memory the horrible experiences he and his fiancée Jane recently went through. Francis and his friend Alan visit The Cabinet of Dr. Caligari, an exhibit where the mysterious doctor shows the somnambulist Cesare, and awakens him for some moments from his death-like sleep.
A government official, Count Muffat, falls under the spell of Nana, a young actress. She becomes his mistress, living in the sumptuous apartment which he provides for her. Instead of elevating herself to Muffat’s level, however, Nana drags the poor man down to hers – in the end, both lives have been utterly destroyed.