Twenty years ago Caitlin vowed never to return to her small Irish hometown. Now she drifts from temporary jobs to temporary men, trying to escape memories of the Hanging Woods. Of what happened to Roisin there. But with news of her estranged mother's sudden death, Caitlin is forced to return home, back to the town where everyone knows each other's business and old resentments run deep. Roisin's sister Deedee, now a Garda, has never given up on finding the truth of what happened in those woods. And Caitlin's return makes old wounds fresh, threatening to exhume secrets that have lain buried for two decades - while the Hanging Woods begin their siren call to Caitlin and Deedee once more.