The bodies of an overnight train conductor and a French business man are discovered lying alongside train tracks. Also found at the crime scene are tomato juice cans full of heroin. But what is the connection between these two men and the drugs? Commissioner Peter Zinn goes undercover as a train conductor to solve the case, which leads him from Berlin to Budapest to Belgrade on the trail of an international smuggling ring.

This dramatic crime thriller attracted over 820,000 viewers to East German theaters.