After the death of his wife, 69-year-old Elmar Kern lacks the drive to make a fresh start. But his late wife had already made provisions for this eventuality - during her lifetime.

Fun-loving Anna and her brittle lodger Mr. Kurtz are already living under the same roof as an old married couple. The balance of opposites threatens to tip when Anna's helper syndrome kicks in twice. Her friend Gundi, who has injured her knee, needs help with her everyday life and a barrier-free home, but she can hardly afford a new apartment on her meagre pension. Anna's ex Willi needs a place to stay even more urgently. Soon there is the danger of a senior citizens' flat share.

A clique meets at Siggi's on Shrove Monday to get ready for the parade. Klaus and Nadine are in a great party mood, but Frederick has lost his girlfriend Diana after an argument and wants her back. Until Siggi eats the pasta salad.

German judge Elke Seeberg's orderly world turns upside-down when a terrorist bomb explodes in a Berlin bus and the federal police come bursting through her door: Allegedly her teenage daughter played a part in the attack and is now on the run. What follows is a Kafkaesque nightmare of illegal round-the-clock surveillance by the Secret Service, public denunciation, and the collapse of her career. But when Federal Agent Buch helps her put together some pieces of the puzzle on her own, the fear of terrorists quickly gives way to the paranoia against an all-powerful state encroaching on all her rights.

The idyll in tranquil Monreal is deceptive: farmer Jobst lies dead in his cesspit, all the clues point to murder. A case for police superintendent Kati Biver and chief inspector Killmer. The latter, however, is rather distracted. The cool cop is suddenly supposed to be responsible for a baby - his baby! Not with him, Killmer thinks, and comes up with an ingenious idea to solve the care issue. He secretly abandons little Marlon outside the police station. Now his colleague Kati has no choice but to look after the little one...

A tall and a small masked man wearing police uniforms driving the local cop car rob 600.000 Euro from a money transport in Eifel town Monreal. Incompetent state inspector Melanie Marschall focuses local police detectives Killmer and Kati Biever, neither of which has an alibi, both had the car keys, even fitting masks where found at Killmer's home. The are suspended, needing to find the -obviously well-informed- real culprits, while precinct colleague Ralf is recruited to spy on them. While Kati's irresponsible grandmother loads further suspicion on them, the cop pair finds several townsfolk and Melanie Marschall in financial need, yet no conclusive clue until a murder raises crucial questions.

Shortly before the celebration of his 95th birthday, Karl Wolter is murdered. Instead of ending their accidental marriage for good on the long-awaited divorce date, Killmer and Kati Biever take up the investigation. The suspects in their case are rather eccentric: the retarded day laborer with the glass eye, a senile chicken baron and Miss Blücher, a housekeeper with an icy stare and a heavy inheritance. During their investigations, Killmer and Kati soon realize that the crime must have something to do with an inglorious event deep in Monreal's past.