Valuable PVC produced in the GDR is being smuggled across the sector boundaries in Berlin to supply Western chemical companies. Officer Schubert begins to investigate the case, but he is at a loss for leads when all the production and export records appear to be in order. He gets a lucky break in the case when his daughter Ursula, who works in the central administrative center for the chemical industry, discovers that the GDR apparently exports more casts than it produces.

This exciting crime story is based on an actual case and was filmed at many famous locations in 1950s Berlin.