His mental health deteriorating, Engström's life falls to pieces. Years later, a prosecutor revisits the case and makes a momentous announcement.

Police railroad another suspect. Desperate for more attention, Engström continues to speak out. Thomas tries to connect Engström to the gun.

Irvell's steady methods turn up more evidence to implicate Engström, but Holmér's stubborn tunnel vision leads investigators into a dead end.

Realizing Engström's story doesn't add up, Irvell starts turning up the heat. Decades after the murder, a journalist starts reinvestigating the case.

Shortly after Palme's assassination, Engström begins his quest for attention as a crime-scene witness. Divisions among police hinder the investigation.