Bob Brown enters the Unit on a training mission in Idaho. An incident in Afghanistan had made it certain that more knowledge about mules was needed. His wife, Kim Brown, simultaneously moves into the Unit's compound where she gets a long row of shocking surprises. Amongst them, the hijacking of a grounded plane with 125 passengers close to her husband's location.
While protecting the Mexican Drug Minister, the team shifts into high gear to rescue his family after they are kidnapped. Tiffy is upset when Mack is ordered some alone time, and Molly takes steps to protect the unit from an outside threat.
While on the way to a mission, another team's helicopter is forced to make a crash landing, and Blane must decide whether to follow orders and abandon them. Back at home, Molly discovers some disturbing things about Ron Cheals.
Bob and his translator survive a helicopter crash in remote Russia, but still must fight for their lives in extreme conditions without their gear, causing Bob to flashback to the selection process that got him into the Unit.
Jonas has been captured in the Republic of Georgia and offers himself up as a bargaining chip for a prisoner exchange. When Colonel Ryan's efforts to gain cooperation from Washington fail, he sends the unit to make its own prisoner exchange. Meanwhile, Tiffy is facing a court trial she will surely lose. Charlotte still refuses to step up and tell the truth, but offers other help.
Jonas and his family celebrate his father winning the Silver Star, but there is trouble when a young soldier takes out his combat frustrations on his young wife. Meanwhile, Mack and Bob must help a man fly a plane after his pilot mysteriously dies.