It's midsummer, and Sweden is waking up to a deafening plane alarm. TV, internet and the telephone network are down, and before anyone realizes what is going on, there are a number of mysterious attacks across the country.
In Stockholm lives Alex, a successful musician who left his childhood home in the country to start a life in the big city. When Sweden comes under attack, Alex will have to go home to the place of his childhood and all the conflicts he moved from as a young man. As the attacks get closer, Alex tries to reconcile with his father and his teenage girlfriend while they fight together to survive.