 Several of Paul’s novels were considered obscene because of their violent and abnormal sexual content.In "The Ripper", one of the stories was an imaginary diary of Jack the Ripper with graphic details.Another short story, "Oidipus i Norden", was inspired by an 1889 murder in south Sweden, Yngsjömordet, where a mother and her son had an incestuous relationship and bludgeoned the son’s wife to death.