For three years, Alex has a peaceful, anonymous life in Italy. However, Alex must abandon this idyllic existence when Ryan persuades her to help him rescue Shelby from an international arms dealer, The Widow.

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

Alex and McQuigg are tasked with protecting a Arabian prince. Meanwhile Ryan and Harry work to uncover an assassination attempt.

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.

The team must control a deadly situation, that may leave them scarred.

Alex goes under cover with a military contractor who is believed to have struck a deadly deal with another country.

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.