This is an interesting film about nuns and murder that was shocking in it's day, but suffers in three areas.
First, it stars Anita Ekberg in her most skintastic role. No, you don't get to see her 40-23-38 body, just a brief flash of bun as she manages to get a quickie in town while she is stocking up on her drugs. Yes, she is a junkie nun and she also has a mental illness or brain disease. You never know which as everyone denies there is anything wrong with her. However, she is prone to fits of rage. Is she capable of murder? The murders starts when she returns from town. They are not particularly gruesome, and those looking for giallo will be disappointed.
Finally, there is a hint of lesbianism, but those looking for full blown nunsploitation should look elsewhere. Her roommate is Italian Playboy Playmate Paola Morra, in her first film. Now, Paola does swing both ways and does give full frontal. She is definitely something to see as she is incredible beautiful, but there is no action between her and Ekberg - you just have to imagine it.
The film was well directed and well written. It was an interesting work, but I feel that it will disappoint more than it will entertain.