When young women begin drowning under mysterious circumstances at Lake Evergreen, Detective Nora Callahan uncovers a chilling pattern that points to something far more calculated than suicide. A hidden online community promises peace and emotional relief, but behind its soothing words lies a manipulative psychologist who believes death is a form of mercy. As Nora goes undercover and comes face to face with the woman behind the forum, the line between vulnerability and control begins to blur. In a battle of wills beneath the surface of calm water, Nora must confront the darkness in others and in herself before more lives sink into silence.