"The Night She Disappeared" is a mystery novel by Lisa Jewell that revolves around the disappearance of a young mother named Tallulah. Set in a small town, the story unfolds as her boyfriend, Zach, and their families search for answers, revealing secrets and hidden connections among the residents. The narrative alternates between the past and present, exploring the events leading up to that fateful night. As the investigation deepens, the characters confront their own truths, ultimately leading to unexpected revelations about love, loss, and the complexities of human relationships.