Mack and Tiffy prepare to leave the Unit, but she begins to feel conflicted when one of her former students, who claims to be physically abused, comes to her for help. The rest of the team are sent to Pakistan to prevent a plan to spread a deadly disease throughout the western world.

The team is sent to Paraguay to eliminate a militia rebel leader, but the mission is put on hold when they must rescue two operators trapped by a sniper. On base, the wives help the fiancée of a deceased Unit member gain custody of her two would be step-daughters.