 Ingmar Bergman adapted her novel "Det vänliga, värdiga" (1954) in 1958, and after that he hired Isaksson to write the screenplay for the film "Jungfrukällan" (1960).Her novel "Klänningen" was adapted by Vilgot Sjöman in 1964, "Paradistorg" became a movie in 1977, directed by Gunnel Lindblom, and Bergman made a television movie of the novel "De två saliga" (1962).Several of Isaksson's novels of the 1950s are marked by religious problems, as ultimately in "Havet" and "Dit du icke vill", where 17th century witchcraft trials in a village in Dalarna are portrayed of the bases of contemporary protocols.