Katya is smart, modest and diligent, but most importantly, she is very convenient for those around her, which they take advantage of. After the death of her overprotective mother, Katya inherits her mother's late lover Andrey Nikolaevich, who has nowhere else to live, along with the house. However, this is not our heroine's main problem. The secrets that her mother hid from Katya during her life, the mortgage debt, because of which she could lose her home, and the mysterious man to whom her mother has been sending large sums of money for many years - Katya will have to figure all this out, and for the first time in her life - on her own.