As Roger Quain transports two black panthers to the zoo, he unwittingly becomes embroiled in a spy mission when a Western agent, Catherine Ullven, asks him to hide a microfilm in one of the animal's collars. When the train derails in the Swiss Alps, the panthers escape, and Roger and Catherine must evade three enemy agents hot on their heels.
Spy Hunt
A microfilm hidden in a panther's collar sparks a high-stakes chase through Switzerland after the animal escapes its cage following a train derailment, with multiple spies racing to claim the valuable intelligence.
