After Russ Baker's Family of Secrets revealed George H.W. Bush couldn't remember his whereabouts on the day of JFK's assassination (hint: It was Dallas) the Bush family realised it was a failure of memory that doesn't work as everyone in the world who was around that day remembers the exact task they were doing as they found out.
To cover this deception a new one had to be written and it's covered in this interview with Russ about his book. Barbara Bush is recruited to drum up a story that also doesn't stand up under scrutiny.
Russ Baker's Family of Secrets is the only American political book I'd recommend people to read. And I've read most of the important post world war biographies.