Bill Bergson, Master Detective (original Swedish title Mästerdetektiven Blomkvist) is a children's novel by Astrid Lindgren.

It is the first in the series about the Swedish boy detective, in English translation named Bill Bergson (Swedish name: Kalle Blomkvist).

Bill and five of his friends also play a mock war game, with the White Roses and the Red Roses vying for possession of an unusual stone.

A film based on the book, Bill Bergson, Master Detective, was produced in 1947.

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