Gangs rule the streets of the rough Gallowburn Estate in Glasgow, but the deepest rivalry of all is between Jamie Gray and his friends, known as the Blood Brothers, and their enemies, the Lawsons. The two gangs clash frequently, but when a phone containing incriminating evidence disappears after a particularly brutal run-in, the stakes are higher than ever. Jamie's mother Jackie is as hard as nails and is not going to let anyone hurt her boy - even if she has to roll up her sleeves and get stuck in. What she wants more than anything though, is to see Jamie turn his back on the street life. And when he meets spoilt rich-girl Allegra, who has a penchant for shoplifting, Jackie thinks she could be Jamie's way out. But with the Lawsons closing in, and everyone taking sides, there is only one way out for Jamie, and to triumph he must take out his biggest enemy...