This is the 65th most frequent Swedish word.
någon
"Someone," "anyone," or "some" (depending on context).
Here, 'någon' is used as an indefinite pronoun to indicate someone or anyone in a general context, typically in a question.
Finns det någon där?
Is there anyone there?
In this instance, 'någon' is referencing a specific but unidentified person known to the speaker who can assist.
Jag känner någon som kan hjälpa oss.
I know someone who can help us.
Here, 'någon' is used as an adjective to refer to an unspecified or any book.