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.

Secret Agent Jack Stalwart is about to decipher a code from his missing brother, Max, when he's called on a mission to Kenya. Someone has been killing precious African elephants for their tusks. Can Jack find the poachers and stop them before they strike again?

While secret agent Jack Stalwart is deciphering a code from his missing brother, Max, he's called away on a mission to Kenya. Someone has been killing elephants for their ivory tusks. Can Jack find the poachers in time to stop them from striking again? Suggested level: primary.

An eager young scientist has brought to life a dangerous flesh-eating dinosaur by crossing its DNA with that of his pet dog, Freddie. Can Secret Agent Jack Stalwart capture the dinosaur before it destroys New York City?

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!

A team of GPF scientists has vanished in the Arctic while doing research on global warming. While rescuing them from the jaws of a hungry polar bear, Secret Agent Jack Stalwart learns of the malicious Black Arctic Project: A group of mysterious villains are speeding up global warming by blowing up glaciers. Can Jack stop them before the entire planet is doomed?

In The Escape of the Deadly Dinosaur, Jack zooms to the city that never sleeps to try to solve the mystery of the missing Allosaurus toe. Starting at the Natural History Museum, Jack's detection takes him to a competitive grade-schooler determined to win the science fair with his experiment crossing his own dog with the DNA from the bone of a dangerous, carnivorous dinosaur. Soon the gargantuan creature is terrorizing New Yorkers and Jack must stop him before he devours the animals in the Central Park zoo!