Miguel's Gift by Bruce Kading

In late 1980s Chicago, Nick Hayden, a rookie INS field agent, is eager to make his mark in the unit responsible for picking up illegal immigrants around the city. Hayden excels, whether he's raiding factories or busting Colombian drug dealers. Seen as a rising star by supervisors, over time the green, idealistic Hayden evolves into what one veteran agent terms a "gladiator," an agent willing to do whatever is necessary to get the job done. But Hayden's real reason for joining INS-the mysterious death of an agent thirteen years earlier-remains a closely guarded secret, even as he reluctantly begins a discreet inquiry to uncover the truth.Hayden's world changes dramatically when he recruits Miguel Chavez, a humble Mexican illegal immigrant, to be an informant to help take down Salvador Rico, the ruthless kingpin of Chicago's counterfeit document trade. Nick faces challenges during the investigation that profoundly alter his career and personal priorities as the story builds to a deadly confrontation.