Katya Yudina is very lucky in life: she was born into a friendly and well-off family, has a wonderful boyfriend, graduated from an architectural institute and receives job offers. But suddenly her mother Elena dies under strange circumstances. In two months, Katya's father, Mykhailo, marries a second time - to a girl Natalia, who is several years older than Katya. Natalia tries to establish a relationship with her stepdaughter, but she can't come to terms with the fact that her father forgot her mother so quickly. The father also dies suddenly: the official conclusion is a heart attack. But Katya is sure that someone is brutally cracking down on the Yudin family.