It's August and the annual Gothenburg Party is in full swing But this year the bacchanalian blowout is simmering with ethnic discord spurred by nativist gangs When a woman is found murdered in the park-her identity as inscrutable as the blood-red symbol on the tree above her body-Winter's search for her missing child leads him from sleek McMansions to the Gothenburg fringes, where "northern suburbs" is code for "outsider" and the past is inescapable-even for Sweden's youngest chief inspector...