In a fictitious trial, twelve members of a jury must decide whether journalist Ian Bailey is guilty of the 1996 murder of French filmmaker Sophie Toscan Du Plantier. Based on real events, the film reconstructs, through the discussions between these twelve people, a case that ultimately invites the viewer to draw their own conclusions.

该剧改编自真实事件。1988年12月21日，伦敦飞往纽约的泛美航空103号班机遭遇恐怖袭击，造成259名乘客和机组人员丧生，另有11名洛克比当地居民死亡。Jim Swire博士（科林·费尔斯 Colin Firth 饰）的女儿也在洛克比空难中遇难，他被提名为英国受害者家属的发言人，竭尽全力调查空难真相。