Author Kamila Shamsie. People smugglers. Family WhatsApp Group.

In her new novel "Best Of Friends" the award winning writer Kamila Shamasie explores the personal and political in Karachi in 1988 and London now. Fourteen year old Maryam and Zahra have been friends for 40 years but can they ever really know each other?

Tonight's File on 4 will highlight the shortcomings of the Police and the National Referral Mechanism – the government pathway set up to provide financial, emotional and legal support as well as access to safe accommodation to victims of trafficking – and reveal how British survivors are being let down by the system. Emma talks to reporter Annabel Deas and we hear from a woman we're calling "Isobel" who is currently at risk of trafficking and lives in fear of her life. She was last trafficked earlier this year when she was gang raped and badly beaten by a gang who have abused her for over a decade. Her abuse began when she was 13 years old.

Presenter Emma Barnett Producer Beverley Purcell

Photo credit; Alex von Tunzelman