Advertising man Roger Thornhill is mistaken for a spy, triggering a deadly cross-country chase.

Benjamin Franklin Gates and Abigail Chase re-team with Riley Poole and, now armed with a stack of long-lost pages from John Wilkes Booth's diary, Ben must follow a clue left there to prove his ancestor's innocence in the assassination of Abraham Lincoln.

The story behind the creation of Mount Rushmore National Memorial.