On 21 December 1988, Pan Am Flight 103 explodes over Lockerbie, Scotland, killing all 259 people on board and 11 residents on the ground. What follows is one of the largest and most complex terrorism investigations ever undertaken in Britain, forcing Scottish detectives and the FBI to work across borders, sift through an enormous debris field and reconstruct how a bomb was placed aboard the aircraft. Based on real events, the series follows both the painstaking search for those responsible and the devastating impact of the attack on the town of Lockerbie and on families on both sides of the Atlantic.
In the first three episodes, the investigation begins amid chaos as police recover bodies and fragments of the aircraft while international pressure mounts for answers. Early clues lead investigators toward possible suspects and networks connected to the bombing, but every breakthrough raises new questions. When Scottish officers travel to the United States with potentially crucial evidence, tensions emerge between agencies, particularly over intelligence the CIA may be withholding about a possible bomb maker. The result is a gripping reconstruction of an inquiry in which forensic evidence, international politics and competing intelligence interests collide, while the families of the victims wait for the truth.

In the final three episodes, the investigation takes a decisive turn when the Frankfurt luggage records and bomb-damaged clothing recovered from the wreckage lead Scottish detectives to Malta. A small clothes shop and the memory of a mysterious customer begin to connect the bomb to a wider international network, while cooperation between Scottish police, the FBI and the CIA becomes increasingly strained. As investigators follow the trail toward Libya, a secret CIA source and similarities with another aircraft bombing appear to offer the breakthrough they have been searching for.
More than a decade after Pan Am Flight 103 was destroyed, the case finally reaches the courtroom. Following years of political negotiation, two Libyan suspects stand trial under Scottish law at Camp Zeist in the Netherlands. But the prosecution still depends on fragile witness testimony and painstaking forensic evidence assembled across several countries. As key witnesses are challenged and doubts emerge, the series builds toward a tense question that has haunted the victims’ families since 1988: will the investigation finally deliver justice?