Washington's Riddles

In this adventure of the Wayback Book series Mariana Jones goes bac in time to 1787.  The story takes place the day before the United States Constitution is to be signed.  George Washington, who would later become our nations first president, discovers that the Constitution is missing. 

In its place is a strange riddle.  Mariana and her new friends set out to solve the riddle.  Instead of finding the Constitution they find two more riddles.  Can the team solve the riddles and get the Constitution back in time to get the Constitution signed by all the delegates?  Will Mariana get back to the portal in time before it closes and she is trapped in 1787 forever?  The nations future is resting on the team.