Christian, the Minister for Health, is already drowning in political and personal troubles when a wave of strange events, accidents, and violence washes over Stockholm. As Elin, an ambulance nurse, pulls double shifts amid the chaos, she misses warning signs about her wife Moa's condition. Meanwhile, teenage influencer Linda senses a crisis and begins speculating online.

Christian sets boundaries with his addict son and buries himself in work as Stockholm's crisis intensifies. When a disaster rocks the city, he's forced to take decisive action. Meanwhile, Linda grows concerned about her neighbors' strange behavior, and Elin's wife Moa's sudden outburst leads to devastating consequences. Elsewhere, a scientist uncovers an alarming discovery.

Linda capitalizes on the crisis on social media while fighting growing anxiety. Her neighbor Johannes embarks on a classified mission, taking his son along, while Elin desperately navigates a crumbling healthcare system to help her infected wife Moa. Meanwhile, Hugo struggles to adapt to prison life as his father Christian assumes new responsibilities amid the escalating epidemic.

Elin helplessly watches the VAKA virus consume her wife Moa while battling early symptoms herself, desperately seeking any cure. As Christian faces public blame for the outbreak, Saga begins to doubt his ability to lead. Hugo, fearing he'll pay for his father's mistakes, reaches out for help from prison. Linda grows concerned for Isak as his father Johannes braces for the worst.

As Stockholm spirals into chaos, Saga turns to military intervention when her curfew proves ineffective. Johannes launches his plan while Linda draws on her knowledge of apocalyptic films to survive. With Moa's condition reaching critical levels, Elin defies protocols to secure help from the government. Meanwhile, Christian finally reaches his breaking point.

Linda and Isak encounter other survivors during their escape attempt, Christian makes a last-ditch effort at redemption. Elin and Moa participate in a desperate experimental treatment, while Saga witnesses the harsh consequences of her policies firsthand. Our stories overlap as societal constructs start to crumble and the people of Stockholm realize nothing will ever be the same.