A group of camp counselors are stalked and murdered by an unknown assailant while trying to reopen a summer camp which, years before, was the site of a child's drowning.
What makes the movie work is that the slasher genre hadn't been set in stone yet, and some choices that director Sean S. Cunningham makes in the film that work against type.
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Rather quaint by today's standards, Friday the 13th still has its share of bloody surprises and a '70s-holdover aesthetic to slightly compel.