When the Unit heads to Pakistan on a mission, a key member of the team stays behind as he prepares to leave Fort Griffith and his Unit family for good.

As Mack and Tiffy uneasily proceed with plans to leave Unit life behind, Mack's former team members are out in the field dealing with struggles of their own. After carrying out one mission to intercept a package in Pakistan, the Unit must regroup and focus on executing a second mission in order to stop a plan to spread a deadly disease throughout the western world. Meanwhile, when Tiffy helps a student in need, she realizes the true impact of leaving the Unit. Also on the home front, Kim and Bob welcome a new addition to their family.

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