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.

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.—Jake Kanter