Major Moritz Eisner (Harald Krassnitzer) and his colleague Bibi Fellner (Adele Neuhauser) find a frightening picture during a night-time operation: the head of the Vienna police academy is shot dead in the living room of his house, his wife is dead one floor up, with a broken neck. What first looks like a relationship drama with manslaughter and suicide soon raises questions: someone else must have been at the scene of the crime. You now have to find this person and a service weapon from which the deadly bullet was fired. A trail leads to the police school, where instructor Thomas Nowak (Simon Hatzl) leads an iron regiment and has a special relationship with a police candidate (Julia Richter). Bibi, who is smuggled into the school as acting headmistress, targets these two. Meanwhile, Eisner, this time supported by the bumbling detective assistant Fredo Schimpf (Thomas Stipsits), is following leads into the red light district. A pair of gangsters tried to blackmail the dead man with scandalous photos from the police academy. From Inkasso-Heinzi (Simon Schwarz),Bibi's old contact from her time at Sitte, comes the insider tip to take on the "stupid Bonny" (Simone Fuith) and the "sweet Clyde" (Sebastian Wendelin). The two have something in their hands that deeply shocks the investigators. The deeper Eisner and Fellner delve into the case, the more human abysses open up – among high-ranking police officers.
In his 40th "Tatort" operation, Harald Krassnitzer, alias Major Moritz Eisner, has to investigate alone for once, because the tandem with Adele Neuhauser as Bibi Fellner is dissolved for tactical reasons - of course only for this one sensitive case, which involves bullying and abuse of power at the Vienna police academy. In "Wehrlos", director Christopher Schier combines an unusual crime story with the usual humor of the series. This time, Alexander Strobele joins the well-established police ensemble with Martin Zauner, Hubert Kramar and Simon Schwarz in the guest role of the exemplary police officer Pohl, who serves justice in his last case.