One long summer, a heatwave descends. Bloated sea creatures wash up along the parched riverbed, animals grow frenzied, ravens gather on the roofs of those about to die. As the stifling heat grips the village, so does a strange rumour: the Mansfield sisters have been seen transforming into a pack of dogs. With the witch trials only a recent memory, hysteria sets in. Slowly but surely, the villagers become convinced that something strange is taking root in Little Nettlebed. And when a bark finally leads to a bite, the sisters will be the ones to pay for it.