I highly recommend this series. It definitely kept my interest, and I loved the way each one of the episodes really moved the story line forward. (It just seemed like a lot happened in every episode, a compliment that a lot of good series wouldn't receive.)
There were a couple things I didn't like. One was the way the graphic, disturbing crime scene photos were repeatedly shown. (Some people might be okay with this, but it just seemed a little gratuitous.)
The other thing I didn't like was because it seemed so unrealistic and hard to believe: The police are hunting down a vicious & very clever serial killer, yet our two lead detectives go blithely alone into what could be very dangerous situations without telling anyone where they are or calling for back up. I don't know: in U. S. crime shows, detectives are always calling for back-up but maybe it's not a thing in Denmark!