Public Eye is a British television series that ran from 1965 to 1975. It was produced by ABC Television for three series, and Thames Television for a further four series. The series depicted the investigations and cases handled by the unglamorous enquiry agent Frank Marker, an unmarried loner who is in his early forties when the series begins. In the words of an ABC trailer for the third series: "Marker isn't a glamorous detective and he doesn't get glamorous cases—he doesn't even get glamorous girls. What he does get is people who are in trouble—the sort of trouble you can't go to the police about, even if you are innocent."

A small boy, Dickie Goodwin, finds some strychnine pills mixed with sweets in a stolen car left in a deserted garage. With them he buys his way into the Rocket Gang. Brian, the leader, shares out the pills for swaps next day. One of the gang eats hers and collapses. The police frantically search for the pills and a broadcast appeal is made. Brian hears this and reaches the gang at Battersea funfair just in time to save them.