Not having paid successive parking tickets, harlot Christina 'Fossi' Mobius's corpse is found wrapped in plastic foil in her mobile home, but only to cover up her decomposing and bruises. The car is identical, including the registration sign, to a man', forcing Edwin and Günter to clear up her double life and more dirty secrets. Meanwhile Gunther's grandson Joshi is neglecting school, blaming his father Hanno for his apparently shaky marriages, which no kin can tackle, but big child Edwin speaks knave convincingly.

Celebrity doubles agency Twins manager Rolf Schulzer was fatally poisoned by a mushroom in his champagne. Edwin and Günter check fake Tom Selleck, Dean Martin, Burt Reynold and so on, plus Petra 'Marilyn Monroe' Kowallek's false target theory. Günther's wife seeks a career challenge as caterer-cook.

Günter's family demands he and Edwin informally investigate a rest home, where three seniors die of officially natural cardiac arrest almost in a row, two without heirs. None had a risk condition, and equally informal autopsy shows a poison, so it becomes an official case. While they remain formally assigned to seemingly unrelated animal cadavers presumably dumped in the river after lab experiments, the home's intake algorithm and business model, based on hefty entrance fees and short stays, may still link to it, but the poisoned high tea treats prove key.

Church choir leader Eckart 'Ecki' sits on a park bench, skull-smashed with a rock. The woman who found him identifies a hooded man, who i arrested using Ecki's stolen s credit card. Hui Ko, Günter and Edwin doubt the klutz's guilt of murder, lacking a motive. Eckart had hired private detective Schneider, who claims to have found no adultery evidence, but ignored the fresh widow's dual persuasion. Alternative suspects include succeeding choir deputy Berger and Ecki's former business partner. Edwin reluctantly takes Gunter's advice to chase of couple of broody pigeons.

Dr. Rosalind Schmidt from forensics is as delighted with the mystery as Edwin, Günter and Ko troubled: a male corpse was fried by a stronger and longer electric current then lighting. It was a wealthy, early-retired children's books author, at the bike shelter near his home. The murdered weapon is found in the basement of the apartment he shared with his present girl fiend, but she seems to have skills nor motive. That may be different for his series of exes, and the seniors wonder about the part of his former therapist Dr. Brix, who still receives $1000 Euros a month.

Laura Frebel was found died in bed from cardiac arrest, the only oddity being three small burns in her neck, as if from a stun weapon. Edwin, Ko and Günter lend growing credence to several neighbor testimonies that they noticed the same type of glowing UFO, there even are smartphone recordings. The type fits a large series in and around Cologne, being documented by an aliens believers group, which Laura was in contact with. Captain Plocher worries about the case as they take recordings to the press, pretending to be police-verified.

Günter and Edwin's great mood after a heavenly quiet day off turns morbid when they discover that 'team chef' Vicky Adam nor captain Ploch had any luck preventing the Cologne police's diversity police imposing on them the self-induced candidacy of a third retired detective, Hannah Gereg, from the crime-lukewarm rural Saurland. The annoyingly entitled crone insists on upsetting everything by demanding things go by the book, except when she follows her own hunches. Teacher Maya Lenz's fatal fall from a bridge was no suicide, probably pushed and definitely high from LSD ...

Gunter wife blackmails him and Edwin with her cooking to collaborate with 'recruit' Hannah on the next case. Entrepreneur Martin Turm was skull-smashed at home and dumped in his own garbage bin. Prime suspect despite amnesia is recently fired employee Sascha Kesko, who openly threatened to kill him, and whose wife had an affair with the victim, a serial womanizer. Yet the team keeps digging for the complex office and private life of colleagues like Manuel Teich.

A corpse in the forest is identified as one of the rookie members of a 'prepper' seminar. It's organized by Walter Sobchak, who is hard core into learning how to survive after the Apocalypse, with his own well-stuffed bunker. The team goes through the participants, but also discovers foul competition in the sale of prepper supplies. Meanwhile Heidrun Hoffmann seeks her own office, further compromises the official assignment to Ko, who even applies for forensics. Erwin shares it as junk storage with Günter, who now transfers there much of the old stuff his wife wants ...

Edwin being affected by the flu, chief Plocher insist to replace him as Günter's partner in the latest case. The corpse is identified as biochemistry student Ann Katrin Kaiser, who made fatal fall using her hobby parkour techniques, but not in training hall, and pushed, during a failed cat robbery. Edwin can't resist rejoining the team, investigating Ann's steady boy friend Till Rosen, whose baby she expected, and two more parkour mates, fellow bank intern Klas and German languages student Lara. Ann robbed only clients of the boys' bank.

While Edwin gets a pacemaker, chief Plocher is found in a stable, holding the bloody knife used to kill the US-German lover of his long-adulterous wife, co-owner of a Cologe equestrian school. Victim and suspect were administered the same memory-impairing drug. The partner has a huge tax debt and tries to hide he, not the victim, wanted to sell as the land in greater Cologne is more valuable then the not so lucrative school. The victim also came into a surprising US inheritance from a distant relative. A fake US embassy employee is identified as a private detective ...

The knife-throwing murder of taxi driver Sven Fischer, a hopeless gambler, leads the cops to the art trade scene, notably adulterous carnival store owner Steffens. Lieutenant Vicky must decide whether a promotion with raise, which she wrongly assumes arranged by chief Plocher, is worth the family inconvenience, and he warns it's only worthwhile if she won'y miss field work badly, as he does.

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