Russian Navy fleet corvette Soobrazitelny gets a new commander, captain lieutenant Aleksandr Slonov. Immediately, there are tensions between him and one of the ship’s junior lieutenants, Leonid Karakash. However, Slonov is determined to make Karakash change his ways. Meanwhile, the rest of the corvette’s crew begins preparation for a military exercise. They are to compete against the Magnitogorsk submarine under the command of Vladimir Nagornov and his crew. They only have 20 days to properly prepare. But first, the corvette’s new sailors must be initiated.