It's the call every officer dreads. Stockholm Criminal Investigator Conny Sjöberg finds a mother and her two young children lying peacefully in bed, their throats coldly and efficiently cut and no signs of a struggle. As Conny and his team get to work they draw a blank on both motive and suspect for these cruel, senseless murders. The only lead they have is a mysterious benefactor of the family - who eludes their every search. Distracted and hampered by the mysterious disappearance of one of their officers, Conny's squad struggles on - until an astonishing discovery turns the case upside down and threatens to tear his team apart . . .