In the final decade of the 19th century, mysterious widow, Hester Appleyard, arrives in Australia, haunted by a secret past. Here, in the new world, she establishes a successful school for young ladies. But six years later, on Valentine's Day, 1900, the enigmatic headmistress allows her pupils to picnic at Hanging Rock. And there, in the strange brooding landscape, something unthinkable happens.