Ulla Strömstedt

Passengers in an american tourist travelling in a country which is not named, witnesses a murder attempt on the country's heads of state, Prime minister Hurkas. On the trip are: John Hillman, as a tourist, a doctor, Björk, who happens to film the event, and his daughter Kerstin. In addition, a person, as it turns out, the evidence against the bombers. He was killed when the bus reaches Sweden. The offender escaping. Kerstin follow and see how he picked up in a yellow car. Kerstin is now a dangerous witness for the men in the yellow car. They try to run over her. When this fails, she is instead kidnapped and taken to a mental hospital. Hillman gives chase and manages to save her. Traces of the yellow car that leads to Stockholm.