When the owner of a big-rig trucking company is shot to death, Detectives Fontana and Green learn that the victim was hauling illegal aliens and suspect a member (Daniel Roebuck) of a citizen's border patrol group; but their only witness is an undocumented Hispanic woman (Aixa Rosario Medina) who risks deportation if she testifies. Meanwhile, prosecutor McCoy is incensed when the witness is physically intimidated as he tries to turn one organization member against the other in court.

After the daughter of one of Van Buren's college friends is found dead in her room, a suicide, Van Buren joins Green and Fontana in hunting down the man who burned her face with acid months earlier, ultimately leading to her suicide. Van Buren is unsuccessful in getting a lot of help from her friend, who is terrified that the man who destroyed her elder daughter's life will destroy her younger daughter as well. McCoy and Borgia's case hits a snag when Van Buren takes the stand and comes close to committing perjury to keep Jason Corley behind bars.