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Who Can Kill a Child? (1976)

IMDb: 7.3
1976

A couple of English tourists arrive on an island where all the children have gone crazy and are murdering the adults

The House That Screamed (1969)

IMDb: 6.9
1969

A strict headmistress runs a secluded school for wayward girls in 19th century France, whose students are disappearing under mysterious circumstances