Ambush in Leopard Street (1962)

This is a really pretty mediocre heist drama that offers little more than a vehicle for cute James Kenney (always "Mr. Longleyyyy" to me) as a young man ("Johnny") who is assigned the task of schmoozing a woman who works for some diamond dealers, so he can help his sister's boyfriend and his pals to rob the place. The robbery itself is almost incidental to a plot that is as weak as yesterday's tea leaves and the story has a certain, melodramatic, inevitability about it that makes it quite a dull watch that the title flatters to deceive... Lower end of the B-movie scale, this one, that you'll soon forget.