What kind of books would that be?

Police Man: The police have ways to determine foul play...  Do you remember that fire in Ängby? A house burned down and a body was found inside.  We knew that the fire had been set to conceal the fact that the person had been murdered beforehand.  So, how could they know that?

 Oskar: Well...

 Police Man: Go ahead.

 Oskar: There was no smoke in the lungs of the person who died.

 Police Man: That's correct. Did you figure that out right now?

 Oskar: No, I read a lot...

 Police Man: What kind of books would that be?

 Oskar: Newspapers and things like that...

Låt den Rätte Komma in (2008) by Tomas Alfredson