Andy Wolf, manic journalist and author of numerous bestsellers on conspiracy theories, visits Inspector Lucas again in her police station. He offers her a deal: she'll help him with his latest research and give him access to the police database, in exchange for him giving her tips on how neo-Nazis are getting weapons from underground weapons storage facilities. Together they would be unbeatable. Lucas brushes Andy off – a weirdo, harmless. Hours later, Andy Wolf's top floor apartment in Regensburg was ablaze. When a burning man falls out of the apartment onto the terrace of the "Camerota" restaurant, the fire becomes a case for Inspector Lucas - who acts with a guilty conscience because she had not taken Andy seriously.
But in the pathology it turns out that the dead man is not Andy, but his co-author Florian Reichelt. Florian Reichelt did not agree to Andy Wolf being paid and threatened to sue him for a sum that threatened his existence. The dead man's pregnant widow, Suse Reichelt, confirms this motive. Andy Wolf has gone into hiding and is on the wanted list . He hides in the "Camerota" restaurant with its owner, the old leftist Daniele Grasso. Andy Wolf makes conspiratorial contact with Lucas. Lucas agrees to a deal with him and – despite a search – lets him go again. Through Wolf, Lucas finds out that there was in fact a historically documented NATO "Gladio" program in the 1950s, in which secret weapons caches were set up.
The weapons and explosives stocks of the local neo-Nazi scene probably come from this camp. Then an attack is carried out on Andy Wolf, who from then on lies in a coma with serious injuries. Suse Reichelt takes care of Andy in a remarkably maudlin way. Did she have a relationship with him, is jealousy a possible motive? With regard to the weapons finds, Johannes Conrad, who has access to the "Gladio" depot, is increasingly becoming the focus of the investigations. Johannes plans a bomb attack on the Kelkheimer Halle, a war memorial symbolizing reconciliation and peace. In a spectacular operation, Lucas and her team manage to prevent the attack at the last minute. But is Johannes also responsible for the assassination attempt on Andy, and is he the killer of Florian Reichelt? 

The psychology lecturer and family man Bernd Stach, convicted of murder, is able to escape from prison after attempting suicide. While the manhunt is already running for him, he already has Ellen Lucas in his sights. She led the investigations that convicted him as the perpetrator. He overpowers Inspector Lucas while jogging and kidnaps her. It quickly becomes clear that Stach isn't out for revenge, but rather to convince Lucas that he was the victim of a miscarriage of justice. Despite the danger she is in, Ellen tries not to be intimidated by Stach and listens to his arguments. When Ellen's colleagues find her and free her, Stach escapes at the last moment. The encounter with Stach left its mark on the inspector.
In addition to the search for Stach, she takes up the old investigations again – despite the skepticism of Chief Inspector Boris Noethen. The main witness for the prosecution, Marie Heusler, who claims to have observed Stach during a party with the victim, is still absolutely sure of her case. Niklas Brettling, whose testimony incriminated Stach, is also interrogated again. Bernd Stach is arrested while trying to assure his little daughter of his innocence. Ellen now has serious doubts about his conviction and continues to press ahead with the investigation. She is amazed that Marie's testimony in court a year ago was not more questioned. Lucas' path leads to Prof.
Kellermann, highly decorated psychology professor and court expert who examined Marie Heusler's testimony in court and still considers her testimony to be credible. Lucas initiates a new crime scene inspection with all witnesses - which makes Marie Heusler very insecure. In addition, Niklas Brettling does not appear for the crime scene inspection. Chief inspector Tom Brauer researches Niklas' background and learns that the orphan Brettling was supported during his time in the children's home by an organization whose board is Kellermann. Marie breaks down shortly thereafter and confesses in conversation with Lucas that Professor Kellermann should never have acted as an expert: The unstable Marie was already in therapy with Professor Kellermann before she testified against Stach.
Inspector Lucas has far-reaching suspicions and is researching on thin ice with Chief Inspector Judith Marlow: Is it possible to manipulate witness statements? And if so, who would benefit from it? Lucas' courageous path takes her deep into the psycho-systemic structure and thus directly to the perpetrator.