The Tower | Preview (ITV)

DS Sarah Collins and her colleague, DC Steve Bradshaw, officers in the Directorate of Special Investigations (DSI), are called to an incident at Portland Tower in south east London.

They find at the bottom of the tower the dead bodies of long-serving police officer, PC Hadley Matthews, and a 15-year-old Libyan refugee, Farah Mehenni. Up on the roof Sarah finds a traumatised five-year-old boy and a rookie police officer, PC Lizzie Adama – the only witnesses to what happened.

Sarah and Steve discover that the dead girl Farah kidnapped the boy from his home and took him to the top of the tower, but they have no idea why. Before they can interview Lizzie she is allowed to go home by her boss, DI Kieran Shaw.

When Steve goes to Lizzie’s flat, she has disappeared. Further complicating matters, they learn from Kieran that Lizzie is a key witness in a murder case involving an organised crime figure who is still at large. According to Kieran this may explain why Lizzie went on the run, it certainly means her life is in danger.

Sarah and Steve attempt to track Lizzie down while also trying to unravel the mystery of what happened on the roof. The further they investigate, the more they suspect that they are being deliberately misled – that Kieran Shaw has, in Steve’s words, sent them down a rabbit hole.

At the episode’s climax, Sarah and Lizzie will come face to face again, and we reveal that Kieran does indeed have something to hide.

The Tower begins Monday 8th November at 9pm on ITV.