In reading order
Secret Agent Jack Stalwart: Book 1: The Escape of the Deadly Dinosaur: USA
Elizabeth Singer Hunt
Secret Agent Jack Stalwart: Book 2: The Search for the Sunken Treasure: Australia
Elizabeth Singer Hunt
The Mystery of the Mona Lisa: France
Elizabeth Singer Hunt
The Caper of the Crown Jewels: England
Elizabeth Singer Hunt
The Secret of the Sacred Temple: Cambodia
Elizabeth Singer Hunt
The Pursuit of the Ivory Poachers: Kenya
Elizabeth Singer Hunt
The Puzzle of the Missing Panda: China
Elizabeth Singer Hunt
Peril at the Grand Prix: Italy
Elizabeth Singer Hunt
The Deadly Race to Space: Russia
Elizabeth Singer Hunt
The Quest for Aztec Gold: Mexico
Elizabeth Singer Hunt
The Theft of the Samurai Sword: Japan
Elizabeth Singer Hunt
The Fight for the Frozen Land: The Arctic
Elizabeth Singer Hunt
The Hunt for the Yeti Skull: Nepal
Elizabeth Singer Hunt
The Mission to Find Max: Egypt
Elizabeth Singer Hunt