Bill Bergson (original Swedish name: Kalle Blomkvist) is a fictional boy detective created by Swedish writer Astrid Lindgren. 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.