A young David McCallum heads the cast of the British melodrama The Secret Place. Set amongst the bombed-out buildings of London's East Side, the film concerns the misdeeds of a two-bit criminal gang headed by Gerry Carter (Ronald Lewis). In a fit of inspiration, Carter masterminds a meticulously planned diamond robbery, actually succeeding in swiping the precious gems. Unfortunately for the crooks, the diamonds accidentally come into the the possession of Freddie Haywood (Michael Brooke), a policeman's son. McCallum plays Mike Wilson, the sullen teddy-boy brother of Carter's girlfriend Molly (Belinda Lee), who tries to inveigle Freddie into giving up the diamonds.