Fifteen years following a worldwide catastrophe, humanity teeters on the brink of annihilation. Society has collapsed, food is in short supply, and many survive through theft and violence. In the barren landscapes of rural Britain, a young boy struggles to stay alive, relying on solitude as his main strategy for survival. However, his solitary existence is shattered when he encounters a band of other survivors and confronts a foe more brutal than they could have ever anticipated.