Letters in a mysterious journal between two sisters describe a lost collection and a missing treasure. As Sam, Derek, and Caitlin realize the letters were from Thomas Jefferson's granddaughters, they set out to do what they do best--solve the mystery When the journal is stolen, the kids are forced to hunt down clues by following Jefferson's footsteps to The University of Virginia, his mountaintop home of Monticello, and a little-known retreat...