Estranged relatives are the cause of all sorts of gruesome goings-on in this horror double bill. In It Happened at Nightmare Inn, a woman searches for her outcast sibling and stumbles upon an inn run by two sinister sisters (Judy Geeson stars). And when a dead millionaire's (John Carradine) will requires that his bitter offspring endure a stay in his mansion before they get their inheritances, the local sheriff must deal with multiple murders.