Private detective Max Männdli lives in Zurich and loves his job, for which he always takes his time in the Swiss manner. When solving his cases, he often chooses his very own investigative methods, which may not be everyone's cup of tea, but are always very effective in the end. He is assisted by his secretary Rosa Emmenegger. In his investigations for private individuals and sometimes companies, Männdli is always on the trail of crimes, which he solves at the same time.