When you take an ordinary man and train him to kill, he becomes dangerous. When his mind is clouded by drugs, he becomes unstable. When he loses everything he loves, he becomes a lethal killing machine. DI Mike Nash investigates a suspicious house fire, the bizarre murder of a young drug addict and the disappearance of a scientist's daughter. When animal right activists lay siege to a laboratory that is later destroyed, Nash and his colleagues are almost overwhelmed by the upsurge in violence. Their enquiries point to a man with a burning desire for revenge. But is he responsible? Or, are more sinister forces at work? Nash has to penetrate a cloak of secrecy to establish the truth.