A group of drunken young people severely beat the couple in love. Subsequently, Aleksandr Shchetinin died in the hospital after receiving injuries from beatings. The court, chaired by Judge Khromova, is to pronounce the death sentence on one of the four participants in the fight, who committed the fatal blow that led to death.

1942, Polar region. The Germans are preparing to capture Murmansk. The submarine Sch-721 is considered lucky, and its captain Aleksei Strogov has the ability to extricate himself from the most difficult situations. He also develops tactics for a periscope-free torpedo attack, despite the skepticism of colleagues and management. And now, when the Happy "Pike" had to take on board the crew of another Soviet submarine, and she was on the seabed with almost no oxygen, Aleksei manages to save people and perform the operation, paying for it with his life...