Richard Attenborough is the naive young "Jackie", in love with his girl "Kitty" (Barbara Murray) but prone to getting into bad company. It is after one such escapade that he finds himself sentenced to three years in borstal. Fortunately for him, the governor (Jack Warden) believes firmly that the purpose of these institutions is to rehabilitate and so he is inclined to try and help the man; unfortunately his habit of falling for the wrong 'uns continues as he soon becomes the quarry of the duplicitous "Rawlins" (Dirk Bogarde) and his gang of would-be escapees. The film follows the path he takes...