The team is still separated as they face attack from the government. Jonas runs from an assassin getting help from a CIA agent, Bob and Kim. Meanwhile, Ryan learns that his wife has betrayed him and the unit.
Jonas leads the team in a mission to uncover the conspiracy that has torn the team apart in order to bring them back together and clear Col. Tom Ryan's name. Meanwhile, Kim keeps the other wives safe from CIA scrutiny.
The reunited team races to stop a plane armed with a deadly nerve gas aimed at Ft. Griffith, and Kim is ordered to broadcast a fake weather report from her radio station to get all personnel to take cover. Meanwhile, Tiffy and Mack continue to struggle with their separation.
Bob, Williams and Grey are charged with rescuing a group of Embassy personnel and their families who are under attack in Abidjan, while Jonas tests his daughter's strength and conviction when she decides to enlist.
As the team works to recover a chip with invaluable information that could prevent a possible terrorist attack, a pregnant Kim is sent to bed rest and Bob proves inept at childcare.
Jonas, Mack and Grey have their hands full keeping a pop diva safe from harm, while Bob and a Justice Department escort face extreme danger as they return a prisoner to his own country to face his execution.
Jonas and Williams perform emergency battlefield surgery on Grey in an effort to keep him alive after he is critically injured during a mission.
Jonas seeks revenge for the murder of Hector Williams, while Brown deals with a rescued journalist ensuring that he won't betray them, and the team copes with Williams' death.
Jonas and Bob watch from the outside as Grey gathers information on gang members he knows from his past who are stealing weapons and deadly explosives that could wind up in the wrong hands. Meanwhile, at the bar, Tiffy gets in an accident when some college students harass her when she gets off work and Tom and Mack both make Tiffy offers to get back together.
Bob's moral conflict over the team's deadly tasks distracts him during a sniper mission, putting the whole team at risk.
As Jonas works with a British agent with whom he has a history, Charlotte Ryan forces him to turn against his former friend who has been working with the scientist they are tracking. Back home, Kim tries to help a desperate woman who has called in to her radio show.