When a plane goes missing over Mount Everest, Jack and his fellow agents must brave the highest mountain on Earth to recover its cargo--the first true yeti skull ever recovered.

Jack Stalwart may be a top rock climber, but no amount of practise can prepare him for the most gruelling climb of all: Mount Everest. When a skull believed to be that of a yeti is stolen by an evil collector of curiosities, Jack must brave one of the most inhospitable places on earth to retrieve it...

When a plane goes missing over Mount Everest, Jack and his fellow agents must brave the highest mountain on Earth to recover its cargo--the first true yeti skull ever recovered.

For fans of the award-winning SECRET AGENT JACK STALWART series comes a must-read new chapter book series! Now Jack teams up with his older brother, Max, to solve new international mysteries, using their special training as secret agents. Secret agents Jack and Max Stalwart are sent to the Amazon jungle to investigate the disappearance of an important Global Protection Force scientist. Soon, they discover that the scientist's disappearance is no accident. A greedy outlaw is illegally mining for gold and he'll stop and nothing to keep his secret safe. Can Jack and Max save themselves and the scientist from almost certain death?

For fans of the award-winning SECRET AGENT JACK STALWART comes a must-read new chapter book series! Now Jack teams up with his older brother, Max, to solve new international mysteries, using their special training as secret agents. Temporarily retired from the GPF-Global Protection Force-and on family vacation, Jack Stalwart and his older brother, Max, are motivated to act when a band of thieves takes the Emerald Buddha from the Grand Palace in Bangkok. Without the help of the GPF, they're on their own. They're also up against one of the smartest and wealthiest villains they've ever faced. Can Jack and Max find Thailand's most precious statue before it's too late?

The third jet-setting installment in the thrilling award-winning chapter book series Secret Agents Jack and Max Stalwart, by Elizabeth Singer Hunt (Secret Agent Jack Stalwart). Now Jack teams up with his older brother Max to solve an intriguing Irish mystery, using their special training as secret agents. Ireland's greatest national treasure, the sacred Book of Kells, vanishes from a library in Dublin. Clues point to the Mastermind being involved. Will Jack and Max be able to find the Book and uncover the Mastermind's identity before he strikes again?

The fourth globe-trotting installment in the exciting Secret Agents Jack and Max Stalwart series, by beloved children's author Elizabeth Singer Hunt (author of the award-winning Secret Agent Jack Stalwart series). Now Jack teams up with his older brother Max to solve a thrilling California puzzle, using their special training as Global Protection Force agents. In the foothills of California's Sierra Nevada Mountains, an unbelievable discovery is made: $10 million in rare coins dating back to the California Gold Rush! Secret Agents Jack and Max Stalwart are sent to protect the treasure. But almost as soon as they arrive, it vanishes into thin air. Little do they know that the culprit is someone from Jack's past. Unfortunately for the brothers, the criminal isn't only after the loot. He wants revenge.