Sondra Locke stars in this obscure gem as Marguerite, an odd, but very intellectual teenage girl who is kept isolated by her vindictive mother and grandmother. When her father comes to visit with his new fiancée, a perverted love triangle develops with Marguerite as the other woman.
Directed by famed cinematographer William A. Fraker, this is a solid psychological horror film with an ending that took me by surprise and adds a whole new layer to everything seen prior. The relationship between Marguerite and her dad, played by Robert Shaw, is quite uncomfortable, especially when he does nothing to discourage her attempts to court him right in front of his fiancée. Marguerite, clearly unhinged from being raised by her man-hating mother, also has hateful conversations with one of her dolls, believing it to be a real person. This, along with Marguerite's fears of being left in her hell, of her father abandoning her again, eventually leads to a murder mystery.
There's strong acting across the board, especially from Locke, who I just saw recently in a similarly off-kilter role in "The Shadow of Chikara". She definitely had a knack for playing creepy. As for the aforementioned ending, it's definitely a stunner. I can think of at least two later slashers that may have been inspired by it.
The film was apparently edited by the studio for no apparent reason, and this shows in the latter half, as scenes seem to end before they've really even begun. It can be a little confusing, and one hopes that the cut bits will be restored some day.