A veteran beat cop and teenage girl fall to their deaths from a tower block in south-east London, leaving a five-year-old boy and rookie police officer Lizzie Griffiths on the roof, only for them to go missing. Detective Sergeant Sarah Collins is drafted in to investigate, working to find Lizzie before she comes to serious harm, but also to uncover the truth behind the grisly tower block deaths.

Gemma Whelan

DI Sarah Collins

Tahirah Sharif

DC Lizzie Adama

Jimmy Akingbola

DC Steve Bradshaw

Emmett Scanlan

DI Kieran Shaw

Bobby Lockwood

DC Lee Coutts

Ella Smith

DS Elaine Lucas

Karl Davies

DCS Tim Bailie

Michael Karim

PC Arif Johar

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