On December 21, 1988, Pan Am Flight 103 tragically explodes over Lockerbie, Scotland, killing all 259 aboard and 11 on the ground. Dr. Jim Swire (Colin Firth), a grieving father who lost his daughter Flora, embarks on a relentless quest for justice. As he navigates the aftermath, he begins to uncover unsettling truths about the bombing and the systemic failures that followed.