Yalta, 1927. While colleagues are racing to make films for the anniversary of the revolution, director Boris Winter begins work on a large-scale adventure film. However, not everything goes as planned: there are not enough funds, a risky stunt leads to injury, during filming on the embankment a drowned man is found in the sea, and then a murder occurs in the film crew itself... To understand what is happening, a young criminal investigation agent Ivan Opalin infiltrates the filmmakers and realizes that not all of them are who they say they are...