After a long-serving cop and a teenage girl fall to their deaths from a London tower block, Detective Sarah Collins investigates the dark heart of policing.
Cast:Gemma Whelan , Emmett J Scanlan , Tahirah Sharif , Jimmy Akingbola , Michael Karim , Robin Morrissey , Laurie Delaney , Karl Davies , Jack Shalloo , Ella Smith , Faith Delaney , Charley Palmer Rothwell , Tamzin Outhwaite , Niamh Cusack , Camilla Beeput , Bobby Lockwood , Nick Holder , Lola Elsokari
DS Sarah Collins is tasked with a cold case. PC Lizzie Adams's willingness to do things by the book is tested.
The investigation into the cold case starts to reveal secrets and possible suspects. The dad is still on the run and one of the daughter's relatives gets involved. An officer is offered a chance to lead a big operation, but he needs to recruit a potentially reluctant team member.
Sarah races to Lizzie's aid and both face Brannon together in a grisly climax.