After losing his daughter in the bombing of Pan Am Flight 103, Dr. Jim Swire begins a quest for truth, searching for why this was allowed to happen and who exactly was responsible for his daughter's death.

As Jim continues his campaign for truth and justice, two suspects are indicted for the bombing, and his focus shifts to bring the men to trial.

After 12 long years, the Lockerbie trial finally begins; but as the trial unfolds, Jim gradually questions the official evidence against the suspects.

Convinced they have the wrong man, Jim grows closer to the convicted Abdelbaset al-Megrahi; as he embeds himself within Megrahi's appeal case and the conspiracy theories swirling around it, he becomes increasingly isolated from his family.

Jim is left at a loss when Megrahi gives up his appeal in return for release on compassionate grounds; questioning everything he has come to believe, Jim wonders if he will ever know the truth.