KC and Marshall are taking a fascinating, behind-the-scenes tour of the highly secure United States Treasury building in Washington DC. They get to watch heavy, loud printing presses stamp out stacks and stacks of crisp new money for the country. But the educational tour takes a shocking turn when someone suddenly realizes that a thick bundle of hundred-dollar bills has completely vanished from the room. Somehow, a clever and daring thief managed to sneak one hundred thousand dollars past high-tech security cameras, armed guards, and heavy locked doors. KC already has a strong suspect in mind, and she just needs to carefully prove exactly how they pulled off this seemingly impossible heist. Team up with the young detectives to examine the high-security building and crack the difficult case. You will learn fun facts about the nation's capital while solving a brilliant financial crime.