A three-part mini-series.
Police constable Jo Gillespie (Sheridan Smith) is devastated when her husband, undercover officer Ryan (Kenny Doughty), is killed under suspicious circumstances. As she battles to stay strong for the benefit of her daughter and stepson, Jo is urged by her bosses, DCS Will Hepburn (Douglas Henshall) and Chief Constable Carolyn Jarecki (Geraldine James), to leave it to her fellow officers to find the killer. But when the murder inquiry starts to uncover some dangerous secrets about Ryan, Jo's faith in her police family is severely tested. No longer sure who to trust, Jo embarks on her own investigation with the help of friend and colleague Jack Clark (Matthew McNulty). But as they close in on Ryan's killer, Jo's hunt for the truth will put her own life in danger.
Original UK air dates: 06/21/2015 to 07/05/2015.