Frank takes heat when a widow blames him for her husband's recent suicide while on the job. Also, when Eddie has a gut feeling about a murder, she and Erin band together to solve the case, and a desperate Luis Delgado tells Danny and Baez that the only way he'll testify against his former cartel is if they protect his sons.

Danny and Baez work with Texas Ranger Waylon Gates when they are put on a case to find the Lone Star Killer. Also, after Eddie's partner, Officer James Addison, mistakenly shoots an undercover cop, internal affairs accuses Jamie of not supervising properly, and Frank speaks with Officer Addison about why he shouldn't turn in his shield.