Heatherton and her boy friend Coster are out for a drive when they crash into motorcyclist Donahue. She gives him a lift, though he insists on calling her "Barbara" rather than her real name. After arriving home, Heatherton tells her aunt (Nolan) about the stranger, and Nolan explains
that Heatherton's great-great grandmother was named Barbara and had an affair with a man named Benjamin Gunther (Donahue's name in the film). Donahue insists that they are reincarnations of the ancestral lovers, and she elopes with him only to discover that Donahue is an escapee from the nuthouse.
The film ends with Donahue attempting to strangle would-be rescuer Sullivan and finally ...