Twenty years after Jens disappeared without a trace from the island of Oland, a package is mailed to the boy's grandfather that contains the worn and mended shoe of a child, prompting the grandfather to contact the child's mother, resume the hunt for the boy, and make a shocking connection between Jens's disappearance and the island's most notorious murder case.
After moving into a new apartment, a woman who has recently been discharged from a psychiatric ward starts hearing persistent knocks, sobbing, and crying, but nobody in the building believes her.
