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.
