Holberg's murder and the hidden inheritance
In Reykjavík an old man, Holberg, is found killed beside a note reading "I am him." Erlendur learns that Holberg raped Kolbrún in 1963, that the police mocked and dismissed her complaint, and that her daughter Audur died at four of a brain tumour caused by an inherited disorder, with her brain later kept in a jar in a pathology collection. The killer is Einar, Holberg's unacknowledged son by another rape victim, who works at the genetics company and traced his own daughter's fatal illness back through its database to the father he never knew.
