With the situation mounting in Iran, getting back to Luxembourg looks grim as John struggles to adjust to life and work in Milwaukee, while a driven homicide detective begins to build her case.

Homicide Detective Agathe Albans arrives in Milwaukee to interview Dennis. John must make a desperate last minute push to remain on the travel team.

John returns to Milwaukee a person of interest in Agathe's investigation, while his already fragile mental state worsens. At McMillan, Stephen's recovery and a sudden promotion further jeopardize the mission.

John returns to Luxembourg where his dedication to his father is put to the test, just as Agathe gathers final evidence that may allow her to learn the truth about John.