"In September 2017, a knock on the door upends Michelle Horton's life forever: her sister had just shot her partner and was now in jail. During the investigation that follows, Michelle learns that Nikki had been hiding horrific abuse for years. Stunned to find herself in a situation she'd only ever encountered on television and true crime podcasts, Michelle rearranges her life to care for Nikki's children and simultaneously launches a fight to bring...