A shock verdict leaves the families unsatisfied, but doubt is cast on the court's decision and 34 years after the bombing, a new suspect is taken into custody.

A Libyan double agent provides the evidence needed to bring the two suspects to court. The trial gets underway, but a key witness changes his story. 

The prime suspects for the bombing of flight Pan Am 103 are a Palestinian terror group funded by Iran. But Scottish and FBI investigators are led elsewhere.

An investigation into the bombing of Pan Am Flight 103 in December 1988, examining unanswered questions and exploring the truth behind the atrocity that left 270 people dead. With access to victims' families, investigators, intelligence officers and other key figures.