As the families of those on board flight Pan Am 103 learn that the passenger plane has crashed over Lockerbie, killing 270, a terrorism investigation tries to find out what happened while a rural Scottish community is left reeling.

While forensic evidence suggests the prime suspects for the bombing of Pan Am 103 are a Palestinian terror group funded by Iran, Scottish and FBI investigators are eventually led elsewhere.

The CIA hands over a Libyan double agent who provides crucial evidence needed to bring the two bombing suspects to court, but the key witness changes his story as the trial gets underway.

The court makes a shock verdict that leaves the victims' families unsatisfied and casts doubt on the decision, but 34 years would pass since the bombing before the US apprehends a new suspect.

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.