Day in, day out, Niklas ‘Nick’ Tschiller and his partner Yalcin Gümer investigate crimes that are happening in Hamburg. But at some point even the policeman needs a break to spend time with his daughter Lenny. Then it says: Tschiller a.D. - out of service - goodbye to Hamburg. However, simply relaxing is easier said than done, because crime never sleeps and a new, very personal case throws a spanner in the works for Nick's plans for a well-deserved break. Even on vacation, the criminal investigator is not sure about his job and so a wild journey soon takes him across Europe, including to Istanbul and Moscow.

Muslim prince Ali and Georgian aristocrat Nino have grown up in the Russian province of Azerbaijan. Their tragic love story sees the outbreak of the First World War and the world’s struggle for Baku’s oil. Ultimately they must choose to fight for their country’s independence or for each other.

The SOKO Köln investigates the cathedral city with humor and often with hard work. Their cases take them into a variety of environments, from the Cologne clique to the terraced housing estates on the outskirts of the city.