Fitness center owner Ekaterina Turinina was found dead in her own bathroom. The investigation establishes that before her death, she had a serious quarrel with her daughter Julia, because of her fiancé Konstantin Rakov, who had a connection with a rival firm Turinina, who had long wanted to buy her business. Catherine considered him a swindler and offered him money so that he would leave her daughter alone. But Konstantin did not take the money. A quarrel with her mother served as an excellent motive for murder for Julia, and she is arrested.