Picnic at Hanging Rock (2018)

On Valentine's Day, 1900, three schoolgirls and their governess vanish on an outing to Hanging Rock in Victoria, and the six episodes are about what that absence does to the boarding school, its headmistress and the town nearby. Every adult turns out to be keeping some version of themselves hidden. This adaptation of Joan Lindsay's 1967 novel is lush, strange and more interested in atmosphere than answers, with Natalie Dormer as the formidable Mrs. Appleyard. Choose it if the not-knowing is what draws you to disappearance stories, and skip it if you need a tidy solution at the end.