Four years ago, beautiful yet troubled Allie Andersen vanished without a trace. The twenty-one-year-old daughter of an acclaimed actress, her disappearance captivated the media, left her family distraught, and became a fixation for online theorists, who implicated everybody Allie knew and loved. Everyone, including her devoted stepsister, Natasha.

Now, Natasha is finally trying to move on. The panic attacks and episodes of hysterical blindness she has suffered since her stepsister's disappearance have diminished, and she no longer obsesses over the speculations of strangers. Until the remains of a young woman's body are discovered in a lonely mountain canyon.

As Natasha reconnects with the sympathetic Detective Ruiz, inexplicable pieces of evidence surface that open her eyes to a family she thought she knew. It seems that everyone in Allie's life had a credible motive for wanting Allie to vanish. Following each new clue, Natasha is determined to finally find the truth, wherever it leads, and whatever the cost.