Following the dramatic climax of season one, rookie PC Lizzie Adama (Tahirah Sharif) returns to her London police station, where she finds herself fighting to protect a mother and daughter in peril. DS Sarah Collins (Gemma Whelan), having transferred to Homicide Command, reopens a cold case involving a missing schoolgirl that leads her to cross paths with Lizzie again. Following Lizzie and Sarah's antagonistic relationship as they are forced to work together for the first time, this latest season promises another complex, authentic and topical crime story that will keep audiences gripped.