The Texas-Mexico border is trouble. Haphazardly splashing across the meandering Rio Grande into Mexico is a risky business. As their predecessors for over one hundred forty years before them did, today's Texas Rangers battle violence and transnational criminals along the Texas-Mexico border. Bob Alexander surveys the personal tragedies of twenty-five Texas Rangers who made the ultimate sacrifice as they scouted and enforced laws throughout borderland counties adjacent to the Rio Grande.