The series is filmed and set in the adjacent towns of Bregenz, Austria, and Lindau, Germany, which are both located on the southeastern shore of Lake Constance.
German homicide detective Micha Oberländer (Matthias Koeberlin) and his Austrian counterpart Hannah Zeiler (Nora Waldstätten) are partners in a (fictional) German-Austrian cooperative police agency located at the border between the towns of Bregenz and Lindau.
Their job is to solve murders that take place with evidence or clues in both countries, and since international boundaries are not defined in the lake, a multinational approach is essential.
[8] About the third film Murder by the Lake 3 - The Sleepwalker the German magazine Focus said, that it offers a solid and exciting entertainment because story and characters are digging deep.
[9] According to rtv Hannu Salonen, the director of the fourth film, pleases in Murder by the Lake 4 - Till Death do them Part with calm storytelling and unmistakable intuition for strong pictures.