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?

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.

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!

The "masterfully chilling" novel that inspired the hit AMC series (Entertainment Weekly). The men on board the HMS Terror — part of the 1845 Franklin Expedition, the first steam-powered vessels ever to search for the legendary Northwest Passage — are entering a second summer in the Arctic Circle without a thaw, stranded in a nightmarish landscape of encroaching ice and darkness. Endlessly cold, they struggle to survive with poisonous rations, a dwindling coal supply, and ships buckling in the grip of crushing ice. But their real enemy is even more terrifying. There is something out there in the frigid darkness: an unseen predator stalking their ship, a monstrous terror clawing to get in. “The best and most unusual historical novel I have read in years.” —Katherine A. Powers, Boston Globe

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?

"The Mona Lisa", the most famous painting in the world, has been stolen from the Louvre Museum in Paris. Can secret agent Jack Stalwart find it before an evil red-haired man takes it out of the country, never to be seen again?

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?