Joan Lindsay’s 1967 mystery novel Picnic at Hanging Rock, adapted for film by Peter Weir in 1975, is now a mini-series playing on Amazon Video in the US and BBC Two in Britain. The creators of the new series no doubt knew that they could not outdo Weir’s sensuous, evocative film. But it is easy to see why they were drawn to the tale. Picnic at Hanging Rock is a singularly persuasive expression of the now widespread idea that civilisation is an oppressive thing from which we all must be freed.