The Celtic Mystery
S1E1
–
Murder by the Lake is a German-Austrian TV crime series that has been produced since 2014 by Rowboat Film- und Fernsehproduktion and Graf Filmproduktion in cooperation with the German television broadcaster ZDF and the Austrian television broadcaster ORF. 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.