Mary Prescott returns to the West after an interview with an Iron Curtain dictator who gave her a safe conduct pass. On the train ride back she meets a soccer player named Jan Gubak. Jan is going to West Germany to see his sick sister.
His sister needs money for an operation. The chance encounter leads to problems when Jan, knowing that Mary's safe conduct pass will prevent her from being searched, asks her to smuggle a valuable watch over the border.
However, once train comes to a stop, she is asked for her passport, but Jan comes in and accuses her of smuggling a watch. Mary claims her innocence and is taken for questioning along with Jan. Eventually the officials look at the watch and they declare it worthless. They let her go and they let Jan go too and they're back on the train.
Jan asks to come into her room and he explains that it was a hoax. He's working underground on an important mission. He said that by accusing her, it took off any suspicion off him. Her reaction wouldn't have been the same if he had told her his plan ahead of time.
He has some microfilm of a man's innocence. He then gives her the small box containing the microfilm. The two say goodbye and Mary promises to clear the man's name with the proof that he gave her.