John Ho is a young copper, born and brought up in London-s East End. He speaks only English - but his blood is pure Chinese. He is a man with an obsession. What had been his happy family in the post war remains of Limehouse has itself been blitzed apart by another policeman's corruption. John Ho's aim is to avenge his mother's death and his father's disgrace. It is largely in order to achieve it that he has joined the police, enabling him to set villain against villain and work his way towards the evidence that will bring the destroyer to justice. But the flagrantly unorthodox methods this involves are playing him into the hands of his prejudiced chief, determined to prove this disobedient misfit mad or bad and get him off his patch.