FBI 3x08 "Walk the Line" Season 3 Episode 8 Promo trailer HD - After a bomb leaves three people dead, the team presses a reluctant informant to gather information from his close friends who are under suspicion. Also, OA finds tension in his relationship with his girlfriend, Mona (Yasmine Aker), when they clash on where the informant’s rights lie, on FBI, Tuesday, March 9th on CBS.