(Oct. 20) -- In a striking admission sure to stoke the imaginations of conspiracy theorists everywhere, a former Secret Service agent reveals how he came "chillingly close" to shooting President Lyndon B. Johnson right outside his home just hours after John F. Kennedy was assassinated.

So reads "The Kennedy Detail: JFK's Secret Service Agents Break Their Silence," a new book co-authored by the former agent himself, Gerald "Jerry" Blaine, and writer Lisa McCubbin. In it, the authors vividly recall Nov. 22, 1963, the fateful night of Kennedy's assassination, when Blaine was assigned to watch newly appointed President Johnson's house in Washington, D.C., in case of another attack....