Literary fraud is nothing new of course. Here's an entry from the Columbia Encyclopedia [R 031 COL].
The New York Times covers more recent fraud in A Family Tree of Literary Fakers.
Let me suggest a few recent memoirs that, so far, have not proven suspect!
Maybe I shouldn't have included the Hall book listed above--I know someone who grew up in the same town as Hall did, and it seems that her recollections, and Hall's recollections, are vastly different! Hummmmm...