Opening credits prologue: By itself, the "Cosh" is the cowardly implement of a contemporary evil; in association with "Boy", it marks a post-war tragedy - the juvenile delinquent. "Cosh Boy" portrays starkly the development of a young criminal, an enemy of society at sixteen. Our Judges and Magistrates, and the Police, whose stern duty it is to resolve the problem, agree that its origins lie mainly in the lack of parental control and early discipline. The problem exists - and we cannot escape it by closing our eyes. This film is presented in the hope that it will contribute towards stamping out this social evil.