An elderly man has been murdered in his apartment with, of all things, an ashtray. When Detective Erlendur arrives on the scene with his partner Sigurdur Olí, they search the victim’s apartment but do not find much in the way of clues other than the photograph of a four-year-old girl that died thirty years ago. This begins the mystery. Who is the girl? What is her tie to the deceased? Is someone taking revenge for her death, thirty years later?