Hilkka is kidnapped. The kidnapper tells Hilka a sad story from the distant past, a youth camp called Children of Summer. The story leads Hilka toward the time and place where evil originated.

Hilkka and Luisa track down the murderer, while Andrés is pushed aside from the center of the investigation. Aarne has found his way north, to his favorite fish-ends. Darkness inevitably descends, both in Spain and in Finland.