The concept of this movie is one of its strongest points. Two teenage girls making a series of prank calls that they 'saw what you did' until by chance they call someone who actually has killed someone. Unlike the other Castle movies I've seen, this one actually has subtext. The girls' blossoming sexuality becomes the main reason for their problems as they (one in particular) are keen to rid themselves of teenage sexual frustration. Joan Crawford has a small role (but star billing, thank you very much) and, as has already been noted, does seem to be quite drunk in her scenes. Unfortunately, she also has about two feet of piled up grey hair that certainly wasn't her best look. She's convincing enough as an aging woman desperate to keep her man. Enjoyable enough for what it is, and recommended to anyone who liked 'Strait-Jacket' and the like.

William Castle made a career out of monster and ghost stories, so even though the synopsis on my TV said this was a departure about teenage girls involved with murder I still expected the same kind of B-movie action. In truth though it was actually a pretty decent thriller.

A sixteen year old girl and her little sister who live in a secluded home a few miles away from anybody get the house to themselves for a night. The older girl invites her friend over for dinner and the three of them eventually resort to prank calling random people from the phone book to entertain themselves. Unfortunately for them they make the mistake of calling a man who's just committed murder and jokingly tell him, "I know what you did, and I know who you are." The man naturally assumes the voice on the line is serious and there is a witness out there who saw him disposing of his girlfriend's body. A variety of twists and intertwining characters eventually put the guilty man in the same room as our innocent kids.

The plot relies heavily on coincidence to stitch everything together and a major plot point hinges on an extremely stupid decision by our protagonists but in spite of it all, it still manages to build a lot of tension towards it's climax which although brief is handled very effectively. It also helps that this secluded home of there's is surrounded by forestry and continually deepening shadows as the night wares on with fog that's barely visible outside the moonlight, making for a very creepy and cool atmosphere. The acting is pretty good too, even our teenage heroes seem to exercise some decent chops all things considered. Good fun and good thrills.

Libby Mannering, her younger sister Tess, and her friend Kit Austin are enjoying a night by themselves when Libby's parents are out. The girls start making prank calls to random strangers. In a series of calls, they would say, "I saw what you did and I know who you are." Steve Marak (John Ireland) receives their call after just murdering his wife Judith. His neighbor Amy (Joan Crawford) has eyes for him despite his marriage. Fearing discovery, Steve disposes the body and tracks down the callers.

I really love the premise. This is alright. With better execution, this could have been a great horror classic. Horror is about to take a leap leaving this movie behind. Despite the great idea, this doesn't have the necessary thrills or scares to be an important horror.