While investigating this house, Lønn discovers that the likely murderer is Olaug's son, Sven. She informs Hole by phone as he and Waaler are checking out the other prospective crime scene. Hole gives this information to Waaler, who immediately leaves to assist Lønn. Hole, using recently installed CCTV cameras, notices another pentagram on a student's door. Eventually, the body of the victim is found at the residence hall, and is determined to actually be the first victim of the serial killer, murdered five days before the first discovered victim. Meanwhile, Waaler apprehends Sven, but his threats to shoot him ultimately lead Lønn to realise that he intended to murder Sven instead of arresting him, leading her to agree with Hole's suspicions.