Denise has spent the last five years dedicated to uncovering the truth behind her sister Michelle's disappearance. Haunted by loose ends, she begins seeing visions of Michelle, who gradually guides her in the right direction. As Denise's marriage and sanity crumble around her, she remains committed to unearthing an unfathomable truth, and coming to terms with a painfully crucial realization--one she has been desperately avoiding.