As a life-long fan and follower of the Tatort series, I have rarely seen a better story or cast performance than offered in this episode. Although it is not very long into the action that the viewer knows "who dunnit", the suspense in smoking out a serial killer builds steadily right up to the very satisfying conclusion.
A noteworthy side-plot shows how a young newcomer to the team is rejected by her father as a disappointment. When the top-of-her class police woman is asked by an experienced peer whether she was following in her father's footsteps, she responds "I make my own footsteps". No matter how well she does in her career, the father continues to put her down, insisting "she will never amount to anything". An important scene near the end addresses that conflict, likely to leave the audience cheering!
If you get to watch just ONE Tatort episode this year...make it THIS ONE!