In a suburb of Philadelphia, police detective Mare Sheehan investigates the recent murder of a teenage mother while trying to keep her own life from falling apart. Mare is a local hero, having been the star of a high-school basketball championship game 25 years ago. She has also been unable to solve the case of another missing young girl for a year, leading many in the community to doubt her detective skills. Her personal troubles include a divorce, a son lost to suicide, and a custody battle with her ex-heroin addict former daughter-in-law over Mare's grandson.