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 PC Lizzie Griffiths on the roof, only for them to go missing. DS 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.

Episodes of this season

Gemma Whelan
DS Sarah Collins

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Jimmy Akingbola
DC Steve Bradshaw

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Tahirah Sharif
PC Lizzie Adama

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Nick Holder
PC Hadley Matthews

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Emmett Scanlan
DI Kieran Shaw

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Harriet Webb
DC Alice Parker

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Nabil Elouahabi
Younes Mehenni

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Lola Elsokari
Farah Mehenni

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Karl Davies
DCI Tim Bailie

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Jim English
DC Jez Vine

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