ENT doctor Katrin Schwitters meets a charming stranger on a training trip who brazenly introduces himself as a Russian secret agent. Due to a storm, the two are stranded on an island in the North Sea and spend a wondrously playful evening together. Katrin also slips into the role of an agent on a secret mission - "real" life is left out of this exciting flirtation.

When Isa provokes the Nazis with a satirical song at her graduation party, she is denied her degree despite passing her exams. She has to give up her plan to become a teacher and, against her mother Petra's wishes, manages to perform in a political cabaret. She enjoys stage success as a singer with an accordion and falls in love with the pianist Laurenz. During the Second World War, Isa's family gets caught up in the wheels of political power and is torn apart - until, after much turbulence, the Vermehrens regain their old cohesion and accompany Isa together as she enters a convent in Bonn.

One could almost believe, two fresh lovers would kiss here tenderly. In fact, Jan and Katja come straight from the divorce judge who finished what had started promisingly - a harmonious, fulfilled marriage and family life. The common house building was too much for their relationship. While a dream came true for Katja, the building was a pure torture for Jan. He escaped more and more and started an affair. When Katja comes after the infidelity, there is only one consequence for her: Divorce.

During the pagan Rauhnächte, unbridled revelry reigns in the former Viking town of Ribe. Even at the police station, where conscientious patrol officer Ida Sörensen is helping out on the night shift, chaos reigns. At this moment, no one is thinking about the sadistic serial killer who kidnaps people and leaves them to starve in the forest.

Kindergarten teacher Hannah lovingly creates a calendar of activities for the coming year to get her relationship with her boyfriend Simon back on track. Through a mishap, however, the calendar falls into the hands of misanthropic Jonathan, a wealthy publishing heir who sets out to find the author with growing curiosity. Miraculously, the paths of the two cross from then on, for the time being without knowing of their connection through the calendar.

A chief commissioner investigates the murder of a young woman and a fatal car accident. Apparently there is a connection between the two cases.

Hannah, mother of two children, is a teacher at a Hamburg high school. She falls in love with her new colleague Bernd Vossler - not knowing what the consequences are. Hannah enjoys being in love with her new boyfriend, but sometimes she is amazed at his behavior. If Bernd does not succeed in something or he is under pressure, he loses his composure and his hand sometimes slips. On a fateful night, Bernd crosses all boundaries.

When Mia runs into her former schoolmate Steffen and his son at the grocery store, she is pleasantly surprised by the unexpected encounter. But the joy quickly turns into unease as Mia and her daughter slowly realize that Steffen's supposed son might be in danger.