When a missing page from the diary of John Wilkes Booth surfaces, Ben Gates' great-great grandfather is suddenly implicated as a key conspirator in the assassination of Abraham Lincoln. The page is one of 18 pages missing from Booth's diary. When doing more research, the conspiracy takes Ben, Abigail, and Riley from Buckingham Palace to the White House - both places they break into - and even stealing a page from a secret book. But in order to see more from the book, their choice is either get elected president or kidnap the President of the United States. So, Ben kidnaps the President. The conspiracy then crosses to Mount Rushmore. Now, Ben will have to clear his family's name so they will no longer be linked to the assassination.