A taxi driver has been brutally stabbed as two teenage girls walk resolutely away, one holding a bloody knife. Inspector Kurt Wallander (Kenneth Branagh) questions Sonja Hokberg, the teen suspect, who replies nonchalantly, “None of this matters.” Since when did murder not matter? Is Ystad, Sweden, on the verge of some sort of chaos? As multiple homicides stack up, Wallander realizes they may be the least of his problems. Adapted from the novel by bestselling author Henning Mankell, Firewall finds Wallander facing a gripping countdown to an impending disaster.