What is this film called?

please help, this driving me crazy!!! Bascially its about two girl teenagers, one geeky, the...other quite quirky, they start to investigate a weird male neighbour who is also a teacher at their school. They go to his house and creep into his office. The teacher randomly kidnaps of the girls and then gets arrested at the end of the film. Quite bad film, but I used to watch it all the time.

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