Air Commodore Raymond approaches Biggles, Algy, Ginger and Bertie with an interesting proposition. Now that the Second World War had ended, he could use good pilots in a new force he is forming as Assistant Commissioner at Scotland Yard. This force would be used to combat flying crooks. The formation of a force would take some time, and there was a pressing matter to deal with and that is where our heroes come in. Biggles would be offered the rank of Detective-Sergeant.