A milquetoast boy shoots a punk that threatened him with a knife, then, fearing his hard bitten police surgeon father, runs away and is joined by a young escapee.
A 15 year-old boy, Chris, in fear of his life accidentally shoots a hood, Mick, that was about to stab him. His father is the local police surgeon who saves Mick's life but he is overbearing and oppressive towards his son. Chris then goes on the run and teams up with a young escapee from a nearby borstal who had been done for robbery. Events escalate when Mick's father finds out where Chris is hiding.
- the boy's name is Chris Kirk (not Tim) who shoots Mick Murphy