Picnic at Hanging Rock is a 1975 Australian mystery film directed by Peter Weir and based on the 1967 novel Picnic at Hanging Rock by Joan Lindsay. Cliff Green adapted the novel into a screenplay. The film stars Rachel Roberts, Dominic Guard, Helen Morse, Vivean Gray and Jacki Weaver. The plot involves the disappearance of several schoolgirls and their teacher during a picnic at Hanging Rock, Victoria on Valentine's Day in 1900, and the subsequent effect on the local community.