Follow Ken Dornstein on his search for the men responsible for the bombing of Pan Am Flight 103.

For some 25 years, FRONTLINE producer Ken Dornstein has been haunted by the bombing of Pan Am Flight 103 over Lockerbie, Scotland—the terrorist act that killed 270 people, including his older brother David. Now, in this emotional and suspenseful three-part serial, Dornstein sets out to find the men responsible for one of the worst attacks on Americans before 9/11. From the ruins and chaos of post-Qaddafi Libya, Dornstein hunts for clues to the identities and whereabouts of the suspects, whom he tracks for almost five years across the Middle East and Europe. With each episode, Dornstein encounters new witnesses and unearths fresh evidence that brings him closer to the truth. Watch this rare, real-life spy thriller that’s also a timely reflection on the legacy of America’s long war on terror and a lyrical meditation on loss, love, revenge and the nature of obsession.