Night School. 1981.
A Boston police detective is assigned the case of a woman being decapitated outside a children's school, as he thinks he is getting somewhere more killings begin to happen. A decent...ish entry into the American Giallo genre, I wasn't really a big fan of this one but gave it a second viewing and enjoyed it more this time round, Rachel Ward is probably the reason why this became a bit more enjoyable than what it should have been. The film does shift from person to person on who the killer is and then we get the big reveal and why they were doing the killings. Most of the kills are done off screen so we get the aftermath of it.
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