Harris County/Birmingham - When a 16-year-old boy is murdered at his family's roadside taco stand, Sgt. Henry Palacios is faced with one of the most tragic cases he has ever seen. Palacios is hot on the trail of his suspect, when another shooting turns the case on its head. And in Birmingham, Detective Marcel Walker investigates the death of a 29-year-old car mechanic, killed when a late-night tune-up turns deadly. When he gets a tip that the suspect is about to skip town, Walker launches a major manhunt.