The story of John F. Kennedy, one of America's most revered presidents. A World War II hero, he rose to the highest office and presided over the tense days of the Cuban missile crisis, when the fate of the world hung in the balance. The youngest president in American history, he was also the youngest to die in office, brought down by the bullet of an assassin, Lee Harvey Oswald, in a murder unsurpassed for its tragedy and controversy.