Sometime in 1864 or 1865, Robert Lincoln, son of President Abraham Lincoln, had a close call with death in a subway station when he was saved at the last minute by an honest-to-God celebrity -- Edwin Booth, one of the most famous actors of the day. Neither man knew their fates would intersect in a much more tragic fashion shortly thereafter, when Edwin's brother, actor John Wilkes Booth, would assassinate Robert's father Abraham.