London's criminal underworld is Martina Cole's muse. The inspiration for many of her dependably dark and gritty novels.

In the second and final instalment of the searing documentary series, the straight-talking author descends on some of the Big Smoke's meanest streets, experiencing the cruel reality of a thriving gang culture first hand. Statistics show that there are over 2,800 active gangs in England and Wales, and 90 per cent of them are dominated by men. But young women are becoming increasingly drawn to and entangled in the corrupt lifestyle and Martina sets out to find out why. Disarming from the outset, the bestselling writer discovers truly shocking details about the role of girls in these gangs, and asks what can be done to steer them onto the right path and prevent generations to come from making the same, life-changing mistakes.