Originally a mathematician, which explains her clever plots and complex characters, Gerhardsen is the author of the Hammarby-series, crime novels that take place in the southern parts of Stockholm, Sweden.
When detective Petra Westman finds an unconscious child in an undergrowth, and shortly after stumbles upon the mother's dead body hidden inside a grit bin, the Hammarby Police team is shocked by the gruesomeness of this case. And the strangest thing is that nobody seems to be missing the victims . . .
But just as an investigation is launched, chief investigator Conny Sjøberg is faced with yet another murder. A teenage girl has been killed aboard cruise ship Cinderella and her younger sister will be next if Sjøberg can't uncover the killer.