In a strange laboratory, three men in weird masks take the blood of a naked young woman in a hood.

Pierre gatecrashes the next party, and a woman commits suicide in front of the other guests when a man shows her picture up on a projector.

[1] McGillivray described the film as a "disconcerting mixture of traditional horror and furturistic sci-fi effects-achieves at its best a quality that is more hallucinatory than erotic.

"[1] McGillivray found that the set, costume designs and sequences at the baroque chateau have "a certain bizarre extravagance, but the essential thinness of the script is reinforced by Rollin's tendency to strive for a sustained mood of mystery by holding shots for several seconds after the action has been completed.

"[1] McGillivray concluded that the "cumulative effect of these delays a deadendingly slow pace which appears more contrived than supernatural.

"[1] "...a mad fever dream as lysergic as you could hope...it takes place in a sort of alternative nocturnal world that resembles our own, but which is firmly rooted in dream-logic" — Jonathan Sisson, February 2017[6] "One of Rollin's early, cruder efforts, this weird and sometimes wonderful film mixes bizarre fashions, clumsy action, beautiful locations, dream images, casual eroticism and, unusually, a strangely humane finale....Absurdly plotted, this is still somehow rather impressive, with a novel premise and leaving you somehow rooting for the vampires, no mean feat."