There's a gun battle on the Thames and John Blythe's assistant is killed. But there something far more dire; the Home Office is upset because someone is selling nylons cheap! So Blythe and assistant Lorna Dean tramp the Docklands until they wind up at Wally Patch's gambling club, where they sell him a few cases of bootleg whisky.
Patch's real racket is buying a lot of stockings in France, killing the seller with his sword-cane and tossing the body overboard. Meanwhile, Miss Dean is kidnapped and stored right next to a telephone, where she can call her boss to rescue her and Blythe, who is knocked around by Patch.
Not only are there obviously mismatched shots; not only is the score bucolic Romantic music (with boogie-woogie for the gambling club) played off scratchy wax cylinders until the 38-minute mark of this 45-minute movie, but this seems to have been shot in Hammer's legendary Marleybone Studio, where each stage was about the size of a bedsit, but.... well, it's worse than even that.
Stunningly awful.