Twins Ike and Iris Carter race from D.C. to Paris to New York on the trail of one of America's most iconic treasures, before it disappears like smoke. The second book in a breathtaking and hilarious middle grade action-adventure series. Fresh off saving the French Four--a quartet of American treasures--and their mom's museum, Carter twins Ike and Iris are back in Washington, D.C. when they're summoned to the National Archives by the...