If you are going climbing to Patagonia and the Fitzroy area in particular, this book you should get, at least a few weeks before you go. You need to assimilate a lot of very useful information here. It seems to cover all known routes and significant attempts, even suggesting unclimbed lines too. The history is given wide coverage with a section in the beginning and with each route as far as its known. Each routs has suggested tactics, equipment and approaches. The author has done a superb job.
And the pictures! This is climbing pornography.