The Eureka Key by Sarah L. Thomson 240 pages

Sam is a master at puzzles. When he wins a contest, Sam learns that he will get to travel across America for the summer. What Sam didn't know is that he would be taking this trip with Martina, a history buff, and Theo, a descendant of George Washington. Sam was recruited to help solve puzzles and clues that were left behind by the Founding Fathers of America. The Founding Fathers left seven keys that will unlock an invention created by Benjamin Franklin, a secret weapon that would help defend the U.S. While Sam, Marty, and Theo are looking for their first key in Death Valley, they come across a group of thugs who are working for Gideon Arnold, a descendant of Benedict Arnold. Together, Sam, Marty, and Theo must work together to make it out of a secret cave while searching for the key. This book is a fast read and reminds me of National Treasure.