Secret Agent Jack Stalwart. Books 1-4, The escape of the deadly dinosaur: USA ; The search for the sunken treasure: Australia ; The mystery of the Mona Lisa: France ; The caper of the crown jewels: England /
Book 1: The escape of the deadly dinosaur: USA -- Book 2: The search for the sunken treasure: Australia -- Book 3: The mystery of the Mona Lisa: France -- Book 4: The caper of the crown jewels: England.