When Annalee Ahlberg goes missing her children fear the worst. Annalee is a sleepwalker whose affliction manifests in ways both bizarre and devastating. One terrifying night her older daughter, Lianna, pulled her back from the precipice of the Gale River bridge. When police discover a small swatch of fabric ripped and hanging from a tree branch, it seems certain Annalee is dead, but Detective Rikert continues to stop by the Ahlbergs' Victorian home. Why does the detective know so much about Annalee?