The great Weir’s career breakthrough came with this lulling yet roiling fugue into the female psyche as it exists in the material world. Based on Joan Lindsay’s novel — itself purportedly inspired by an actual unsolved case — and breathtakingly shot on Australian locations by BAFTA Award-winning cinematographer Russell Boyd. In 1900, a boarding school for women run by Rachel Roberts sets a field trip from which three students and a teacher do not return…