In a small Australian town during one long, hot summer, the Bloom family is beginning to unravel. Marital secrets, new and long-hidden, start to surface, with devastating effect. And while teenagers Tilly and Ben are about to step out into the world, nine-year-old Ada is holding onto a childhood that might soon be lost to her. When Ada discovers an abandoned well beneath a rusting windmill, she is drawn to its darkness and danger. And when she witnesses a shocking and confusing event, the well's foreboding looms large in her mind.