Book excerpt: Middle school geniuses Sam, Martina, and Theo head to Glacier National Park to find the second of seven artifacts--keys that unlock a secret weapon--left by the country's Founding Fathers. The clues lead them to look for Thomas Jefferson's Eagle's Quill at a Montana ranch. But dangerous Gideon Arnold, descendant of the infamous Benedict Arnold, is hot on their trail. He takes their chaperone and the ranch owners hostage until the kids deliver the quill. Can Sam, Martina, and Theo, with the help of rancher girl Abby, find Jefferson's artifact before it's too late? They enter the wilderness to solve riddles and escape traps that protect the quill . . . but if they find it, can they keep it away from Arnold and save everyone? In this fast-paced adventure full of action and interactive puzzles, the kids and readers must use their wits to save our nation by uncovering its greatest secrets.