Private detective Drongo is invited to an international political conference in the Belgian city of Bruges. He and several other high-ranking guests decide to travel by train. Immediately after departure, a murder occurs in the first-class carriage— a Turkish ambassador is killed, one of the conference participants. It’s clear the crime was committed either by one of the passengers or by the conductor. But by whom, exactly? Drongo begins an investigation with the aim of catching the murderer before the train reaches Belgium. However, it turns out to be very difficult, because the criminal is a professional—and he isn’t sitting around waiting for exposure…