imon is a nine-year-old autistic boy who has cracked the government's new "unbreakable" code. This skill renders the new billion-dollar secret code vulnerable, especially if enemies of the United States should learn of Simon's abilities and capture him. Program chief Nick Kudrow orders the "security threat" eliminated, but Kudrow hasn't counted on renegade FBI agent Art Jeffries (Bruce Willis).

Overview from themoviedb.org