When a bird flu pandemic reaches the picturesque yet uncanny island Gotland, panic spreads among the inhabitants who are frantic for an elusive cure. As the community becomes more desperate, the hunt for scapegoats begins. Extremist and anti-immigrant groups gain ground while nurse Sandra Hägg makes a gruesome discovery at the health clinic where she works - a discovery that will cost her life. Soon Detective Inspector Maria Wern is handpicked to investigate the case.