In an effort to expose the mafia resident, the criminal investigation inspector infiltrates the criminal environment and finds out who is hiding under the guise of one of his bosses.
After training at the dolphin reconnaissance school, the dolphin Tristan was sent on an important mission to a secret military base of the USSR to obtain information about the Russians' new strategic weapon - a submarine that transforms into an airplane. After receiving a message that an unidentified object was discovered in Soviet territorial waters, moving towards a secret base, the Soviet command ordered to urgently send an experienced special agent, the dolphin Isolde, to intercept it.
The Soviet border guards received information about an upcoming drug transit in the Far East aboard an American seiner. At the same time, a group of especially dangerous criminals escapes from the strict regime camp. Moving away from the pursuit of border guards, bandits take hostage the crew of the seiner. Soviet border guards, together with the US Coast Guard, are fighting criminals.
Dolphines Tristan and Pavlova adopt a boy, Mikko, left behind after a shipwreck.
The film is dedicated to Dmitry Ilyich Ulyanov, the younger brother of V.I. Lenin, a professional revolutionary, doctor and creator of the first Soviet sanatoriums and rest homes in the Crimea.
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