Who Is Hannah Thompson on ‘FBI’? How She Ties into the Latest Case

Hannah Thompson first appears in Season 4, Episode 8, “Fire and Rain.” The team starts tailing the leader of a terrorist group and discovers his plans to attack the city. While they track him down, Hannah is presented as a sort of key witness. As a woman who was widowed by the 9/11 attacks, Hannah eventually began a relationship with her new boyfriend, unaware that he is the terrorist leader that the FBI has been searching for. With no clues as to his whereabouts, the team turns to Hannah.