When a psychologist with national security intel goes missing on a hike in the Swiss Alps, the Fly Team works alongside a friendly face, Agent Tyler Booth to find him. Meanwhile, Mitchell receives unnerving news regarding his biological father.

When a suspected American arms dealer with a lengthy rap sheet pops up in Vienna with stolen weapons, the Fly Team sends Mitchell and Smitty undercover to try to infiltrate his operation. During the mission, Smitty enters muddy waters while working with the suspect's wife. Meanwhile, Mitchell's biological father shows up in Budapest after being released from prison to seek him out despite Mitchell's disinterest.