In the border zone of the Soviet-Polish state border, gangs of the Organization of Ukrainian Nationalists operated. Captain Olkhovik was given the task of infiltrating the OUN gang.

At the southern border outpost the Soviet border guards managed to neutralize a spy from one of the Western intelligence services and discover an electronic unit recording data about secret strategic military facilities located on the territory of the USSR.

Border guard officer Anton Pekarsky, after serving for ten years on the border in Central Asia, decides to return to his native Belarus. He is repelled by the attitudes that began to prevail at his former place of service after the collapse of the Soviet Union — corruption and complicity with illegal border violators. Therefore, at first, he turns down an offer to head one of the border outposts on the Belarusian‑Lithuanian border. However, when he arrives at his native border town with his daughter, Anton Pekarsky realizes that his integrity and experience in border affairs are very much needed there...

From 1917 to the end of the 1980s, Soviet border guards are stationed on the territory of the USSR from the Far East to the western borders.

When the Soviet Union ceased to exist, the young country faced the task of protecting its borders using its own resources. To address particularly challenging tasks related to combating smuggling, illegal emigration, and carrying out many other dangerous operations, a separate active measures service was established — OSAM. It will be headed by Anton Pekarsky, a veteran of the Afghan war.

On instructions from Polish intelligence, a group of bandits dress up in Red Army uniforms and attack a Soviet border town.

The film unfolds on two parallel planes. Scenes depicting the tense, uneasy routine of the border where the young protagonist Ata serves are interwoven with the less dangerous, yet still emotionally charged episodes from the life of the beautiful young Leila, his fiancée, who remains faithful to him despite receiving a proposal from a very successful young graduate student.

A group of saboteurs was sent into Estonia in 1959. This group included a local resident who also has his own personal goal: to find the daughter he lost at the end of the war while fleeing abroad.

The head of the border detachment Gamayun arrives in Turkestan to destroy the last large formation of the Basmachi - the gang of Mumin Bek.

Chekist Olga Anisimova, who infiltrated the White Guard center in Harbin, and border guard Aleksei Mogilov prevent a number of provocations on the Chinese Eastern Railway, uncovering a conspiracy between the White Chinese and the White Guard center in Harbin.