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Three years following the events of season two, Alex abandons a peaceful, anonymous life in Italy to help Ryan rescue Shelby from a notorious black market arms dealer who is holding her hostage and demanding a ransom only Alex can provide.

In tracking down the origin of a deadly strain of tuberculosis threatening Americans, Agent Ryan Booth must go undercover and infiltrate a white supremacist organization.

The team must protect an ex-CIA agent to take down a cartel kingpin, an assignment that puts all of their lives in danger.

Alex and McQuigg are assigned to protect a prince following the assassination of an emir – but the team soon realizes the killer is closer than they think.

When a physics professor at a major U.S. university steals weaponized uranium, the team scrambles to find the professor and the missing uranium before it can be used against an important international summit meeting in New York City.

Jocelyn shares her very personal story of hearing loss when she finds herself face-to-face with the adversary responsible for the bomb explosion that changed her life forever. Meanwhile, the team works together to take him down and infiltrates an illegal, underground operation that has deadly consequences when not everyone comes out alive.

The team is tasked with protecting a scientist who has developed a deadly technology that, in the wrong hands, could have devastating consequences to mankind. Meanwhile, Ryan and Shelby stumble on something personal of Alex's that signals a possible change in her personal life.

Alex goes undercover with an American military contractor who is believed to have struck a deadly deal with another country; but in the end, it's Alex's life on the line.

Lives are in danger as the team protects Shelby when she reunites with someone from her past, resulting in deadly consequences.

When Owen and McQuigg learn heartbreaking news about family members, the team goes on high alert as they quickly learn nowhere is safe.

Conor Devlin has plans of his own when he plots revenge and returns to his home country, Ireland. Meanwhile, the team unknowingly finds themselves as a pawn in his plans.

Conor Devlin continues to seek revenge as someone from Alex's past comes back into her life.

The team is in Ireland, and when they finally come face-to-face with Conor Devlin, not everyone comes out alive. And Alex makes a life-changing decision about her future.