Psychiatrist Dr. Gwen Moore is an expert on the dark corners of the mind, often delving into the psyches of California's deadliest predators. When a teenager survives an encounter with the feared Bloody Heart serial killer and accuses local teacher Randall Thompson, the case seems open-and-shut. But defense attorney Robert Kavin, haunted by his son's murder by the same killer, believes in Thompson's innocence. He enlists Gwen's help to psych-profile the assailant and the victims in a desperate bid to clear his client's name. As Gwen's involvement deepens, she begins to question not only the case but also the motives of those around her, including Robert's own buried truths. 'The Good Lie' navigates the treacherous lines between truth and deception in a shadowy world where innocence and guilt intertwine.