David Letterman used to do a segment on his show called "Brush with Greatness," in which an audience member recalled a fleeting encounter with a famous person--say, bumping into Joan Rivers on an elevator. American Son (Henry Holt & Co.; 294 pages), the much anticipated memoir of John F. Kennedy Jr., by Richard Blow, feels a little like an extended literary version of this, as Blow unearths every last encounter with his subject, as if to say, I knew him; I really, really did.
Blow, the former executive editor of Kennedy's magazine, George, made headlines even before the book was written:...