When middle school puzzle master Sam and history wiz Martina win a contest for a summer trip across the US, they discover they've been drafted into something vastly more extraordinary. Joining another
Middle school geniuses Sam, Martina, and Theo arrive in New York City on a mission. They're after the third key left behind by the Founding Fathers. They've escaped the forests of Glacier National Par
When middle school puzzle master Sam and history wiz Martina win a contest for a summer trip across the US, they discover they've been drafted into something vastly more extraordinary. Joining another
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 l
For middle grade fans of National Treasure and Indiana Jones, this smart, action-packed series continues with more enticing historical mystery and interactive puzzles. Like Alexander Hamilton, this
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 l
