Life is good for university friends Sarah, Ruth, Charlotte and Kathy—it's summer, exams are over and they're escaping to a cabin by the Blue Pool. But then Sarah disappears without a trace.
Twenty-five years later, a man walks into a police station claiming to know something about the missing girl. Suddenly the three women—now estranged—all become suspects. For not everything was as it seemed, and the greater the secret, the deeper it lies....