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Lindgren's detective story is about Bill Bergson, a more-or-less ordinary Swedish boy with an extraordinary fascination for detective work. He lives in the small town Lillköping. He identifies clues, investigates enigmas, and solves the riddle surrounding a mysterious stranger while the police and other adults overlook or dismiss the whole matter. He and his friends several times solve real crimes including murder and kidnapping. Lindgren wrote shorthand for Harry Söderman, a doctor in Criminology and it was during this work that she learned the basics of criminology that she later used in her stories.
Bill and his friends also play a game they call the Wars of the Roses. He, along with his two friends Anders and Eva-Lotta, are the White Rose, while three other kids, Sixten, Jonte and Benka, are the Red Rose. They "fight" over the possession of Stormumriken, an oddly-shaped stone. The group that doesn't have the stone must use all their wits and energy to obtain it. The group that has the stone must give the other group clues on where to find it.
Although there is a "war" between the two roses all six of the youngsters are good friends and there is simply a playful rivalry between them. The Red Roses help the Whites when they are threatened by real dangers.
Lindgren wrote three books about Bill Bergson:
- 1946 – Bill Bergson, Master Detective (original title: Mästerdetektiven Blomkvist)
- 1951 – Bill Bergson Lives Dangerously (original title: Mästerdetektiven Blomkvist lever farligt)
- 1953 – Bill Bergson and the White Rose Rescue (original title: Kalle Blomkvist och Rasmus)
Films about Bill Bergson
- 1947 – Bill Bergson, Master Detective
- 1953 – Bill Bergson and the White Rose Rescue
- 1957 – Bill Bergson Lives Dangerously
- 1996 – Bill Bergson Lives Dangerously
- 1997 – Bill Bergson and the White Rose Rescue
The character Mikael Blomkvist in Stieg Larsson's Millennium Trilogy is dubbed "Kalle Blomkvist" by the press to mock him in his investigative reporting. Lisbeth Salander's name appears to be taken from Eva-Lotta Lisander, and is modeled in most other respect on Lindgren's other famous character, Pippi Longstocking.
In The Girl with the Dragon Tattoo, three of Lindgren's books are mentioned: The Children of Noisy Village, Bill Bergson and the White Rose Rescue (although in the book the translation was Kalle Blomkvist and Rasmus from the original Kalle Blomkvist och Rasmus), and Pippi Longstocking. The relation between Astrid Lindgren and, at least, the first part of the Trilogy, can be taken farther when the fact that, in it, a cat is named 'Tjorven', is considered. The name comes from the Swedish television series Vi på Saltkråkan based on one of her books. Apart from this, the TV show dates from the early sixties, around the time when, in Stieg Larsson's novel, one of the crucial events which shapes the story takes place.