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?

Jack finally receives a coded message from his brother Max, possibly detailing his whereabouts. But duty calls, and Jack is whisked away to the sweltering savannah of Kenya before he can decipher it. Once there, a wise and kind Masai chief alerts Jack to a series of elephant killings where the corpses have been robbed of their tusks. Jack must find the malevolent ring of poachers responsible before more of these endangered species are destroyed.

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.

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?

Want to learn how to make and break TOP SECRET messages like a real spy? If so, this book is for you! In this exciting, award-winning nonfiction companion to the debut series SECRET AGENTS JACK AND MAX STALWART, readers ages 8 - 12 years old can learn behind-the-scenes codebreaking and spy skills. Inside are more than 80 pages of tips, tricks, and practice exercises for writing and deciphering cryptic communications. You'll learn how to make your own invisible ink, hide your messages, create unbreakable ciphers, and craft your own decoder gadgets. You can use this manual to learn how to exchange top secret notes with friends.

In The Caper of the Crown Jewels, Jack is summoned to solve a matter of grave national importance: the theft of the Crown Jewels of the British Empire from the Tower of London. Arriving on the scene, he is greeted by a traditional Tower guard- a Yeoman Warder (or Beefeater)- who explains what's missing: The Imperial State Crown, the Sovereign's Orb, and the Sovereign's Scepter with the cross containing the finest-cut diamond in the world, the Star of Africa. Jack identifies Ivan the Incredible and his assistant, Jazz, as the thieves immediately--but puzzling out how they did it is stickier. The famous Tower has the most advanced security in the world, and even using his impressive gadgets (the Encryption notebook, Heli-Spacer, Rock Corer, and Rope Tornado) Jack is flummoxed by how the jewels were spirited out. However, Jack can conjure up more than gadgets--he foils the evil magicians with some powerful mojo of his own, dispels an invisibility enchantment, and narrowly avoids the executioner's block before restoring the jewels to the crown and earning the gratitude of the Queen herself!

On the eve of the first manned mission to Mars, a madman has kidnapped the space project's chief engineer. Can Secret Agent Jack Stalwart save the day and keep his cool when he finds out who the missing engineer is?