Biggles – Air Detective contains seven short stories. They are all Air Police stories. They are as follows:-THE CASE OF THE BLACK SHEEP (Pages 5 to 16)An ex-RAF Officer is using his aircraft to smuggle nylons into the UK, picking them up from a ship.THE CASE OF THE VISITING SULTAN (Pages 17 to 28)A notorious US gangster is planning to attack a Sultan\'s aircraft in order to steal his diamonds.THE CASE OF THE UNREGISTERED OPERATOR (Pages 29 to 41)Biggles goes to prison in order to uncover an illegal air transportation operation for criminals.THE CASE OF THE WOUNDED AGENT (Pages 42 to 53)Biggles is sent on a special assignment to save a secret agent, and his information, from Bulgaria.THE CASE OF THE BRILLIANT PUPIL (Pages 54 to 64)An excellent flying pupil, who already knows how to fly, is using his solo flights for illegal reasons.THE CASE OF THE MURDERED APPRENTICE (Pages 65 to 80)Biggles uncovers a smuggling operation from Holland when investigating why a man was murdered.THE CASE OF THE STOLEN AIRCRAFT (Pages 81 to 93)A man who has designed a new plane is stealing aircraft for the aviation fuel they contain.(The book cover shows a portrait of Biggles in his flying gear with a seaplane behind him)