Stockholm swelters in an unrelenting heatwave, tensions between fascists and communists simmer past boiling point, and the city feels like a pressure cooker.
Harry Kvist wants out.
Before he can leave, his old friend and former lover Reverend Gabrielsson is brutally murdered. Kvist notes the police are more interested in fuelling anti-Semitic rhetoric than catching the killer, so he decides to take on one last case.
During the investigation the former boxer stumbles on a Nazi terrorist plot, uncovers police corruption, and is caught up in a brewing turf war between two of Stockholm’s worst gangs. With his back firmly up against the ropes, can Kvist turn this fight around, or will he finally tap out?