An exemplary couple, Ralph and Anna Eldred have devoted their lives to doing good. Decades earlier, as missionaries in Africa, the newlywed and naïve couple blundered badly, suffering a nearly unimaginable horror. Shattered by their encounter with inexplicable evil, they returned to England, never to speak of it again. When Ralph falls into an affair, however, the past resurfaces, and Anna finds no forgiveness in her heart. Twenty years of repressed rage and grief explode, threatening to destroy not only a marriage but also their love, their faith, and everything they thought they were.