1975 film directed by Dario Argento

A young man returns from Rome to his sister's satanic New York apartment house.

A madman haunted by the ghost of his ex-wife carves a corpse-laden trail.

A young girl, with an amazing ability to communicate with insects, is transferred to an exclusive Swiss boarding school, where her unusual capability might help solve a string of murders.

An American ballerina arrives in Hungary to enroll in a ballet school and it soon becomes apparent that things are not what they seem.

Florinda Bolkan plays the daughter of a prominant English politician who keeps having recurring "nightmares" in which she makes love to a bisexual nympho who lives downstairs and conducts all-night LSD orgies. When the nocturnal wet dreams become murderous, the neighbor turns up dead, and Florinda is the main suspect. Did she actually commit the murder she dreamt about? Is she being framed by her philandering husband? Did Florinda actually make nightly visits downstairs aside from borrowing the occasional cup of sugar? How DID Florinda's letter opener end up stuck in the dead neighbor's chest anyway? The complex plot unfolds amidst red herrings, outlandish dream sequences, lesbian hanky panky, and ominous close-ups of Florinda Bolkan's guilt-ridden facial expressions every time someone mentions the murder. All this takes place in swinging late-1960's London.

A masked serial killer with psychosexual issues strangles female coeds with scarves before dismembering them. When a wealthy student identifies one of the scarves and thinks she has a lead on a suspect, she becomes the killer's next target, retreating to her family's remote cliffside villa with three of her girlfriends.