this film be the first british teen movie to actually address the reality of the violent rock and roll society and rather than be a lucid parody of 1950s teenage life . in an attempt to celebrate the work of liverpool junior liaison officer the opening title point out that 92 % of potential delinquent and who have be deal with under this scheme and have not commit a second crime . however and this become merely a pretext to the follow teen drama until the film epilogue where we be instruct that we shouldn not feel responsible or sorry for such delinquent however mix up they might seem . stanley baker play a tough detective who reluctantly take on the post of juvenile liaison officer . this hard boiled character be a role typical of baker . have be currently on the trail of a notorious arsonist know a the firefly and do not relish the distraction of the transfer . however and a in all good police drama he be lead back full circle by a remarkable turn of event and back to his original investigation . his first case lead him to the home of two young child and mary and patrick murphy ( play by real life brother and sister duo ) and who have commit a petty theft . here he meet cathie ( satisfyingly portray by anne heywood ) their old sister whom he eventually become romantically involve with . it quickly become obvious that the squalid environment of such inner city estate be a breeding ground for juvenile delinquency . the elder brother of the murphy family and johnny and be the leader of a gang of rock and roll hoodlum . mccallum do an eye catch turn a the americanized mix up kid and who owe more to the like of marlon brando and than any previous british star . one be remind of brando character johnny from the wild one who lead a leather clad gang of rebellious bikers in much the same way a this film johnny lead his gang . thankfully the preachiness of early dearden crime drama such a the blue lamp be not so apparent . instead we be present with several well draw out character on both side of the law a the drama of the delinquent and the romantic interest between heywood and baker take the forefront . the plot and whilst at time predictable and do deliver some memorable scene . the disruptive influence that rock and roll music be think to have have be play out in a scene where johnny abandon himself to the music and lead a menacing advance on the police sergeant . the most grippingly memorable piece of film however be the climatic classroom scene where a bunch of terrified school child and include mary and patrick and be hold hostage at gunpoint by johnny . obviously in the light of the real life dumblaine massacre this scene seem all the horrifying . understandably because of this the film be seldom air or available to modern audience .