The Gates family is a famous adventurer family. Ben (Nicolas Cage) learned a shocking secret about his family when he was a child: the place where the country's wealth was buried when the United States was founded was hidden in the Declaration of Independence. Although his father didn't want the Gates family to be entangled in national treasures, Ben started a treasure hunt with computer expert Reilly (Justin Bartha). Ben's treasure hunt quickly reached an impasse. At the same time, British tycoon Ian (Sean Bean) is also eyeing the treasure. He sent people to infiltrate the American National Books to find the secrets of the treasure in the Declaration of Independence and plot against Ben. After learning of Ian's sinister intentions, Dr. Abigail (Diane Kruger) of the library is determined to help Ben find the national treasure...