Dougal Haston, John's father's climbing partner on that fateful climb, wrote a book called "Direttissima". It was a great book, but sadly out of print.
John Harlin (The father) was in the US Air Force. He was (to my knowledge) the first to use aerial photography to plan mountain climbs. Actually they chartered a helicopter and saw the monster first hand, as well as photographed it.
John the elder was a fabulous climber whos early great firsts were in the Western US.
I also believe that parts of the movie Eiger Sanction were loosely based on this fateful climb.
Sadly, Dougal Haston also died in Switzerland, but in 1977 while skiing, not climbing. He held the record for the highest altitude bivouac, Everest with Doug Scott, after a successfull summit.