My dislike for books by Jon Krakauer has unfairly prejudiced me against books written by journalists, and this book proved why I should cut journalists-turned-bookwriters a break.
This is an exhaustive discussion of the measures taken along the U.S.-Mexico border to keep immigrants out, to assuage the fears of people along the border and far from it, and of the myriad problems with all of the attempts at a solution. Although this book reveals the border as a human rights tragedy, it manages to portray everyone involved -- gun-toting Anglo ranchers, immigrants, church groups involved in humanitarian work, the Tohono O'odham whose misfortune it is to have their lands bisected by the border -- in depth and with empathy. Not a small feat.
A little bit out of date now, but great coverage of the issue up until it was published (2004?), and it reads quickly.