The People(1972)

A young woman is assigned to teach school in a secluded valley whose inhabitants appear stern, secretive and anti-pleasure. Following two children who disappear to play in the woods, she finds that this is actually a community of extraterrestrials with mild paranormal powers who are attempting to repress and deny their heritage for fear of arousing prejudice and hatred in their human neighbors. Based on a series of novels by the late Zenna Henderson.