The story started with the discovery of one of the women murdered outside the club. She had been stripped and had had her heart cut out. The local police (Kripo) were not really interested in finding the killer once they realised that the victim was a prostitute.
A search through the archives of the local paper revealed that there were murders in the area relatively frequently. Having found the reporter and quizzed him more extensively and from clues in some of the stories themselves it became apparent that there were a number of similar killings and that there was a pattern of approximately monthly (with some variation) murders.
All of those killings happened within a defined area with a centre about 500m from the club (in the bombed area) and they were all at night with victims who had been on their own.