Big City Secret (German: Großstadtgeheimnis) is a 1952 West German crime film directed by Leo de Laforgue and starring Ingrid Lutz, Fritz Wagner, and Joachim Teege .

[1] It was shot entirely on location around Berlin, Hamburg and Dresden, partly using pre-war stock footage.

It is inspired partly by the criminal Sass Brothers active in the Weimar era.

Two master criminals break into the vault of a bank at Berlin's Wittenbergplatz and steal a large sum.

However, detectives set out to find and secure the necessary evidence and bring the criminals to justice.