A real Hungarian spy story from the 60s. An entire army of spies across the ocean is fighting for the Hungarian invention that protects humanity, because in this country they would only start manufacturing it in the next five-year plan. The checkered briefcase is carried by the engineer of the invention office over mountains and valleys, on trains and in the air. The prominent figure of the police group led by Pharaoh, the Mummy, also gets involved in the complicated chases.