In the seventh book of the Capital Mysteries—an early chapter book mystery series featuring fun facts and famous sites from Washington, D.C.—KC and Marshall are thrilled to take a tour of the United States Treasury where stacks and stacks of money zip off the presses in the printing and engraving building, millions of dollars a day. But the friends find that a bundle of bills is missing. That’s a hundred thousand dollars – gone! How did the thief slip the money out past cameras, guards, and locked doors? KC has a suspect. She has a clue. Now she just needs to figure out how in the world it was done!