Jack Mathias and the Boonetown Bandits by GM Savage

He's known as the class clown - the kid with a lot of nerve. And some believe thirteen-year-old Jack Mathias is too confident for his own good. His audacious practical jokes and impulsiveness frequently land him in hot water and growing up seems a world away. However, a sudden wild adventure with his unlikely companions, Gene (the nerd) and Edgar (the shy outcast), thrusts Jack towards maturity with more of a shove than normal life would ever have managed. Will he meet the challenge?
The trio's illicit and desperate quest to find long-hidden treasure leads them into great danger, challenging their collective wits and testing the limits of their physical and mental endurance. Will Jack, the natural, fearless leader, discover the ancient jewels and a different version of himself in the process? Or will he avoid personal responsibility for the rest of his life?