Based on a novel by an anonymous writer who used a pseudonym of John W. Grow. Both director Kjell Sundvall and producer Börje Hansson claim that they don't have a clue who that is.
When Kjell Sundvall was set to direct, he was drowning in letters from people that wanted to share their theories of the actual murder of Olof Palme. This led to a decision to not slip any information about the shooting of the film to the public.
Originally in pre-production in 1993 when producer Börje Hansson led hands on the then unreleased novel but wasn't able to find a proper director.