"In Lillköping, the exciting war between the Red and the White Rose continues. One night when the White Rose is out to recapture the coveted Kingdom of Stormum, they witness how the Professor and his little son Rasmus are kidnapped by unknown men. Eva gets into the kidnappers' car and manages, with the help of various clues, to lead Kalle and Anders to the perpetrators' headquarters. It turns out that the Professor has invented an impenetrable plate and the head of the kidnapping league will stop at nothing to find out where the formulas are hidden. It's quite a knife situation they found themselves in, but luckily Kalle Blomkvist is at hand...The new film about Kalle Blomkvist was made a little tougher than the previous one from 1996, with more emphasis on action scenes, and Göran Carmback, who was now also responsible for the script, explained that, although he modernized the language, he more clearly marked that the new film was set in the break between the 50s and 60s.Kalle Blomkvist and Rasmus was made with largely the same team as the Kalle Blomkvist film from 1996. New in the context was the Rasmus character, who was played by William Svedberg and was generally highlighted as a find. SF found him at a daycare center on Söder in Stockholm during the preparations for a planned TV series about life in a daycare center."