Spy Hunt

Roger Quain (Howard Duff), escorting two zoo-bound black panthers on a train from Milan to Paris, is unaware that Catherine Uilven (Märta Torén) has hidden a microfilm in the collar of one of the animals. When the train is derailed in the Swiss Alps and the panthers escape, she is forced to involve him in her mission, which now includes enemy agents hunting the microfilm, the animals, Catherine, and Roger.