The border must be guarded against insidious intruders, of that the brave border guard has no doubt. He takes in a shot dog, gains its trust, and eventually, thanks to it, catches an enemy agent who wanted to disrupt the peaceful life of our progressive people.

• Československý armádní film
• Eduard Cupák
• Zdeněk Dítě
• Karol L. Zachar
• Josef Bek
• Miloš Nedbal
• Eliška Kuchařová
• Ilja Racek
• Anton Mrvečka