When Annalee Ahlberg goes missing, her children fear the worst. Annalee is a sleepwalker whose affliction manifests in ways both bizarre and devastating. Once, she merely destroyed the hydrangeas in front of her Vermont home. More terrifying was the night her older daughter, Lianna, pulled her back from the precipice of the Gale River Bridge. The morning of Annalee's disappearance, a search party combs the nearby woods. Annalee's husband, Warren, flies home from a business trip. Lianna is questioned by a young, hazel-eyed detective. And her little sister, Paige, takes to swimming the Gale to look for clues. When the police discover a small swatch of fabric, a nightshirt, ripped and hanging from a tree branch, it seems certain Annalee is dead, but Gavin Rikert, the hazel-eyed detective, continues to call, continues to stop by the Ahlbergs' Victorian home. As Lianna peels back the layers of mystery surrounding Annalee's disappearance, she finds herself drawn to Gavin.