在两个孩子误打误撞进入制毒窝点被绑架后，特警老兵“枪手”(Gunner)需要深入毒枭帮派内部，在与犯罪分子和当地警方周旋下救下他的海紫。
When a retired Green Beret soldier is murdered by an Albanian drug gang in London, four of his veteran SAS comrades set out to avenge him, dispensing their own brand of justice on the streets of London.
