Secret agent Jack Stalwart searches for a diver missing from the Great Barrier Reef and a treasure that has vanished from the wreck of the HMS Pandora while trying to defeat a deadly band of pirates.

When the Mona Lisa is stolen, Jack Stalwart, a secret agent with the Global Protection Force, must find it before it leaves the country and is never seen again.

Jack is an ordinary kid who becomes a secret agent by night, thwarting evil all over the world as he searches for his missing brother, Max. Destination: Kenya. Finally, Jack receives a coded message from Max! But before he can decipher it, Jack is called away on a mission to Kenya. Someone has been killing elephants for their ivory tusks. Can Secret Agent Jack Stalwart stop the poachers before more of these endangered animals are destroyed?

Jack is an ordinary kid who becomes a secret agent by night, thwarting evil all over the world as he searches for his missing brother, Max. In the United States 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 Stalward capture the dinosaur before it destroys New York City?