By the end of Episode 1 of FRONTLINE’s special three-part series, My Brother’s Bomber, filmmaker and author Ken Dornstein had crossed several names off 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. 6, to see what happens. You can check your local listings here and watch a trailer above.

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