Bill Bergson Lives Dangerously (original Swedish name: Mästerdetektiven Blomkvist lever farligt) is a 1957 Swedish film about Kalle Blomkvist, directed by Olle Hellbom. It is based on the novel with the same name, written by Astrid Lindgren. It was recorded in Trosa, Södermanland.

There are differences between the book and this film:

• The murderer wears checkered trousers instead of green gabardine trousers.
• The mansion house has been changed to a "ghost castle".
• In the end, the murderer tries to escape with his car, but here he instead escapes with a boat but can't because Kalle, who also is on the boat, takes the revolver from him and shoots holes in the boat.

Cast

• Leif Nilsson as Kalle Blomkvist
• Sven Almgren as Anders Bengtsson
• Birgitta Hörnblad as Eva-Lotta Lisander
• Sigge Fürst as Björk
• Nils Hallberg as Loan Shark Customer
• Siv Ericks as Mrs. Lisander
• Erik Strandmark as Mr. Lisander
• Georg Skarstedt as Karl August Gren
• John Norrman as Fredriksson
• Ragnar Arvedson as Georg Berg
• Hjördis Petterson as Mrs. Karlsson
• Carl-Axel Elfving as Journalist
• Birger Lensander as Sixten's Father
• Richard Paulson as Sixten
• Lasse Starck as Benka
• Sven Thunborg as Jonte
• Bengt Blomgren as Forsberg
• Eivor Landström as Sixten's Mother