When a Russian biochemist is assassinated for trying to defect with his highly sensitive biotoxins research, the Fly Team springs into action to protect his daughter, whose father's last wish was that she get his research to a trusted American microbiologist. Meanwhile, Mitchell stays behind to help Vo during her recovery, and Booth clashes with Smitty when he finds out she could jeopardize his promotion.

FBI: International Season 4 Episodes...

• s04e01 - A Leader, Not a Tourist
• s04e02 - The Other Hard Part
• s04e03 - Nothing Sudden About It
• s04e04 - The Unwinnable War
• s04e05 - The Future's Looking Bright
• s04e06 - They Paid More
• s04e07 - Keen as a Bean
• s04e08 - You'll Never See it Coming
• s04e09 - The Kill Floor
• s04e10 - Keep Calm and Deliver The Biotoxin
• s04e11 - Veritas Fidelis
• s04e12 - Blood Doesn't Become Water
• s04e13 - You've Been Greenlit

FBI: International Show Summary

Follow the elite operatives of the Federal Bureau of Investigation's International Fly Team. Headquartered in Budapest, they travel the world with the mission of tracking and neutralizing threats against American citizens wherever they may be, putting their lives on the line to protect the U.S. and its people.

The Fly Team's Special Agent Scott Forrester, their accomplished and dedicated leader, puts his missions ahead of his personal life and is rarely seen without the team's secret weapon - their trusty Schutzhund dog, Tank. Second in command is Special Agent Jamie Kellett, not afraid to tussle - in an alley or courtroom - and her extensive network of informants is a powerful resource. Special Agent Andre Raines shines in the field and makes good use of his accounting background in tracking criminal enterprises' moving money; and the group's newest member is Special Agent Cameron Vo, a competitive West Point grad who excels at interrogation and strategy. A key part of the mix is the unflappable Europol Agent Katrin Jaeger, a multilinguistic liaison between the FBI Fly Team and each host country they inhabit.