A collection of cases from the archives of the Special Air Police.

• The Case of the Black Sheep - Biggles and Ginger crack a nylon smuggling racket run from a remote sheep farm
• The Case of the Visiting Sultan - Biggles plays decoy for a diamond thief after a Sultan's Jewels.
• The Case of the Unregistered Operator - Biggles cracks a scheme ferrying criminals overseas to provide cast-iron alibis
• The Case of the Wounded Agent - Biggles flies into the Balkans to retrieve an agent and some very important documents
• The Case of the Brilliant Pupil - a qualified pilot repeats his training to gain a plane for nefarious purposes
• The Case of the Murdered Apprentice - a young aircraft apprentice is murdered when he stumbles on a racket in smuggled feathers
• The Case of the Stolen Aircraft - an eccentric inventor steals planes from the RAF to fuel his development of a new aircraft