[1] It's based on an original idea from Klaus Arriens and Thomas Wilke who also wrote the scripts for all six episodes.
Sunny is eager to take the lead, but her superiors give that to her colleague and send her to therapy.
Suspicion has become her second nature and when Sunny finds out who may have attacked her, she wages a proxy war with the hunt for Haffner, revealing more parallels between them than she would like.
[5] The Frankfurter Allgemeine Zeitung on the other hand, criticizes the introduction of the characters, but states that the series finally comes into its own in the second episode.
[6] Tilmann P. Gangloff for Tittelbach.tv wrote that the twisty und exciting plot enfolds on two levels: the crumbling network of relationships on one hand and the cat-and-mouse-game-like hunt for serial killer on the other, which both escalate eventually.