Carol Hammond, a married upper-class woman and daughter of a prominent lawyer, experiences disturbing LSD-induced hallucinations in which she imagines wild orgies hosted by her alluring actress neighbor. When the neighbor is found dead under mysterious circumstances, Carol becomes the prime suspect.

Heightened by psychedelic imagery and a hip Ennio Morricone score, this Swinging London-set giallo from Lucio Fulci plumbs the mysterious unconscious. The underside of the hippy dream morphs into a blood-soaked nightmare, culminating in a stunning chase sequence through the iconic Alexandra Palace.