Blood Oxygen

'Murder is the first rule of nature', de Sade once wrote. 1996 saw the only sadomasochistic murder committed in Estonia. Without apparent reason, two schoolgirls tortured a man to death. Young scriptwriter Margit A. starts to gather information about the case. She intends to write a feature script, but one question keeps cropping up. Why did the girls do it? Are we really capable of doing the same?