It would seem the stuff of a fevered thriller if it were not all true: Street gang members from San Diego recruited by a drug cartel are embroiled in the murder of a Roman Catholic cardinal at the Guadalajara airport. Border guards struggle to resist the relentless temptation, despair, and lawlessness at the international line, while Mexican federal police ride shotgun for drug lords in Chevy Suburbans stolen in San Diego. A tunnel is dug under the...