As Episode 2 of FRONTLINE’s special three-part series, My Brother’s Bomber, came to a close, filmmaker and author Ken Dornstein was zeroing in on one last name from his list of potential suspects in the bombing of Pan Am Flight 103 over Lockerbie, Scotland.

Where will his search for answers into the attack that killed his brother and 269 others take him next? Tune in on Tuesday, Oct. 13, to see how the story ends. You can check your local listings here and watch a trailer above.