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
A veteran beat cop and a teenage girl fall to their deaths from a tower block in south-east London. Left alive on the roof are a five-year-old boy and rookie police officer Lizzie Adama, who disappears within hours. Detective Sergeant Sarah Collins is charged with leading the investigation, trying to track down Lizzie before she comes to serious harm and uncovering the truth behind what happened.
With Lizzie still on the run, Sarah finally persuades her boss, DCI Tim Bailie, to go public about Lizzie's disappearance. Later, she makes a series of discoveries about the events that led up to the Portland Tower fall which further complicate the case.
Lizzie decides to turn herself in, but first she meets Kieran Shaw in secret, who tries to persuade her not to implicate herself. When Sarah finally interviews Lizzie, the explosive truth about what really happened on top of the tower emerges.