It is a silly, delirious, wonderful thing, a true 'melodrame' as the subtitle suggests, showing us in a hideous mirror the repetitious cycle of living death we are caught in our everyday lives.
Three young, modern, attractive Parisian types arrive for no stated reason at the chateau, spouting psychobabble, convinced that the girls are delusional and mad, needing help.
After a psychoanalyst unsuccessfully tries to convince four sisters that they are not 200 year old vampires, the Queen of the Vampires promulgates the cause of the Undead.