Skip to main content
Horror Cult Classic

A morphine-addicted nun unleashes madness and mayhem inside a Catholic hospital.

KILLER NUN

From the Secret Files of the Vatican!

1979 · 1h 22m · NR · Horror / Mystery / Thriller · IMDB TMDB

A demented nun sliding through morphine addiction into madness, whilst presiding over a regime of lesbianism, torture and death. Sister Gertrude is the head nurse/nun in a general hospital, whose increasingly psychotic behavior endangers the staff and patients around her.

5,471 FilmsIn The Vault
Vault UpdatedDaily
Curated ByHumans
No AlgorithmBullsh*t
Vault Note

Proof that the habit doesn’t always make the nun—sometimes it makes a killer.

Programmer's Pick

Killer Nun takes the nunsploitation formula and injects it—quite literally—with morphine, trauma, and an unforgettably unhinged Anita Ekberg. Between hospital corridors, sexual obsession, and a parade of sleazy giallo shocks, this is Italian exploitation at its most deliriously transgressive.

— SassyFlix Programmer
Quick Answer
What is Killer Nun about?

Killer Nun is a 1979 Italian horror, mystery, and thriller film directed by Giulio Berruti about Sister Gertrude, a nun whose descent into addiction and psychosis leads to chaos and death within a Catholic hospital.

Themes & Keywords

Female Nudity Murder Female Rear Nudity Nudity Female Full Frontal Nudity Violence Female Frontal Nudity Death Blood Cult Film Revenge Rape Sex Gore Lesbian Sadism

Synopsis

Sister Gertrude, a nun who works in a Catholic hospital for the elderly, returns to work after healing from surgery to remove a brain tumor. Gertrude suffers from significant anxiety following her surgery, and believes that her cancer has returned, despite the hospital's lead doctor, Dr. Poirret, assuring her there is no evidence for it. The Mother Superior of the convent also dismisses Gertrude's fears as hypochondria. Sister Mathieu, who has an unspoken sexual attraction to Gertrude, believes Gertrude's worry is legitimate.

Unbeknownst to the convent, Gertrude begins leading a double life, venturing into the city and pursuing sexual encounters with random men. Gertrude also begins to intravenously abuse morphine and heroin that Sister Mathieu steals for her from the hospital. A change in her personality is noted by Dr. Poirret, as Gertrude begins to mistreat patients and revel in reading gory hagiography on the lives of tortured saints to them. Gertrude successfully manages to have Poirret fired from the hospital. While Gertrude is in a drug-induced state, Sister Mathieu's grandfather, a patient at the hospital, is bludgeoned to death with a lamp, and his body thrown out a window so as to appear as a suicide. Sister Mathieu finds Gertrude's veil with his body, but, pledging her loyalty, assures Gertrude she will not implicate her, promising to burn it to hide the evidence.

Following Dr. Poirret's dismissal, the young and handsome Dr. Patrick Rowland is hired as his replacement. During a rainstorm, Gertrude witnesses Jonathan, an elderly male patient, having sex with a young female orderly outside. Later, she awakens from a nightmare in which she suffocates Jonathan, though she is unable to discern whether it was merely a dream or if she might have actually committed another murder. Jonathan's corpse is found the following morning lying in the grass. After leading a prayer for Jonathan, Gertrude has a nervous breakdown. Shortly after, Janet, another patient, is bound and gagged by an unseen assailant before being ritualistically stabbed in the face with needles and slashed in the head and neck by a scalpel.

After Janet's body is found hanging in an elevator shaft, Dr. Poirret sedates a panicked Gertrude. When Gertrude awakens, she confronts Peter, a middle-aged patient on crutches, who claims to have knowledge of who is committing the killings. Gertrude believes him, assuming she is being framed, but he will not reveal any further details to her. In response, she steals his crutches from him. After Peter's body is found in the boiler room, Gertrude is escorted out of the hospital and met by the Mother Superior, who scolds her for her behavior and has her sent to an isolation cell to be sedated. Meanwhile, Sister Mathieu confesses to Dr. Roland to stealing drugs for Gertrude, and threatens suicide if she is exposed. She then begins to seduce him.

Meanwhile, isolated in her cell, Sister Gertrude sits in a catatonic state, detoxing from her drug abuse. As she regains mental clarity, she recalls the first murder committed in the hospital, of Sister Mathieu's grandfather. Gertrude realizes that it was in fact perpetrated by Sister Mathieu, as Gertrude watched in an intoxicated state. Gertrude, psychologically fragile and in a state of perpetual drug use, mistakenly assumed she was committing each of the murders, when it was in fact Sister Mathieu, motivated to kill by the sexual abuse she suffered as a child by her grandfather.
Details & Specs
Director
Giulio Berruti
Writers
Alberto Tarallo, Giulio Berruti, Enzo Gallo
Release
1979
Runtime
1h 22m
Country
Italy
Language
Italian
Also Known As
Sister Murders, Geständnis einer Nonne, The Killer Nun, La Petite soeur du diable, Killer Nun, Suor Omicidi (original title)

Why Cult

Anita Ekberg Unleashed

Screen legend Anita Ekberg sloughs off glamour to play the dangerously unstable Sister Gertrude on a downward spiral.

Nunsploitation Blitz

The film revels in taboo-busting with lesbian longing, morphine abuse, sexual perversion, and murder behind convent walls.

Sleazy Giallo Mashup

A heady mix of giallo mystery and exploitation sleaze, featuring hospital horrors, erotic encounters, and a body count.

Italian Video Nasty

Certified as a cult 'video nasty,' Killer Nun offers strong sexual content, nudity, and scenes of suffering that earned its notoriety.

Trailer

Questions from the Vault

What is Killer Nun about? +

Killer Nun follows Sister Gertrude, a nun working in a Catholic hospital, as she descends into morphine addiction and psychosis, resulting in violence and sexual transgression among patients and staff.

When was Killer Nun released? +

Killer Nun was released in 1979.

Who directed Killer Nun? +

Killer Nun was directed by Giulio Berruti.

How long is Killer Nun? +

Killer Nun has a runtime of 82 minutes.

What genre is Killer Nun? +

Killer Nun is a horror, mystery, and thriller film.