This time around, Hood is running the California-Mexico border with the ATF, searching for the iron river the massive and illegal flow of handguns and automatic weapons that fuels the bloody cartel wars south of the border. Gunrunners by nature arent exactly ethical, but the lengths theyll go to, and the innocent lives theyll risk, are shocking even to Hood. Most shocking of all is the close personal connection Hood finds wrapped up in events south of the border a connection that shakes him to his core.