", originally released in the UK as Erotic Blue) is a 1972 Italian giallo film directed by Giuliano Carnimeo, identified in the credits as Anthony Ascott.

[2][3] The film was referred to as "never boring" and "a competent thriller which offers enough violence and sex to satisfy the most ardent giallo fan".

[4] In 2015, a novelization of the film by Michael R. Hudson was published in the United States by Raven Head Press as part of a series of adaptations of several of Gastaldi's scripts, including The Horrible Dr. Hichcock and My Name is Nobody.

She is stabbed to death in the elevator by a masked killer who vanishes before it reaches the top floor, where the tenants (violinist Professor Issacs, widow Mrs. Moss, and casino stripper Mizar Harrington) discover the body.

On her way out of the studio, Jennifer is accosted by Adam, the leader of a sex cult named “Iris” she was a part of before escaping into modeling.

To entice them to star in his advertisements, Andrea sublets Mizar’s now-vacant apartment to Jennifer and Marilyn.

Close to dawn, the killer enters the apartment by the balcony and wraps their hands around Jennifer’s throat, but flees when she awakens and screams.

Marilyn arrives and finds the blood-soaked iris on the floor before opening a closet and discovering Adam, stabbed to death.

She breaks into the neighboring apartment and is attacked by Mrs. Moss' son David, who is deformed and lives in a hidden room.

They exit and explore the room before Sheila is burned to death by a jet of hot steam from a boiler sabotaged by the killer.

Unable to cope with Sheila’s lesbianism, he blamed her sexuality on the other women in the building and murdered them for revenge, killing Adam for interfering with his plan.

He modeled his disguise after David’s, who wore a similar one while acting as a peeping tom on the other tenants, and plans to frame him for the crimes.

Throughout the movie there is an underlying tone of sexual identity, the main protagonist of Jennifer is pursued by her sinister ex-husband Adam, a cult leader who demands absolute loyalty to him and believes Jennifer is simply part of the cult and refuses to respect her individual identity.