In this page-turning new adventure series, nine-year-old secret agent Jack Stalwart travels the world in search of his lost brother while solving thrilling international crimes. The pulse-pounding adventures accompany fascinating geographical, cultural, and historical facts.
In The Mystery of the Mona Lisa, Jack is sent to the Louvre Museum in Paris to track down the theft of the world's most beloved painting. He must match wits with a seemingly invisible mastermind in order to stop Leonardo's masterpiece from slipping into the criminal underground forever. Can Jack's Hypo-Disk overpower a glove that shoots laser beams from its fingertips? Jack's adventures in the city of light demonstrate once again that when it comes to outsmarting the baddies, Jack is the go-to agent with endless tricks up his sleeve.