In 1967, eleven schoolgirls and their teacher take a field trip to the public gardens in Sydney. There, Miss Renshaw and her young charges meet the teacher’s friend and possible paramour – a gardener and a poet. The charismatic Morgan takes them to a nearby wet, low-roofed cave, ostensibly to see some sacred Dreamtime paintings. The girls are both giddy and alarmed at this unauthorised excursion, but are warned of its secretive nature. After a brief exploration the girls retreat to the rocky shore, leaving Miss Renshaw and Morgan behind in the cave, never to be seen again.