A mortgage is when you buy one apartment for yourself, and a second one for the bank. “Down with mortgage slavery! Stop feeding the bankers! Land for the workers, factories for the peasants, water for the sailors!” Lucy Lyutikova is in a revolutionary mood; she decisively dissuades her friend Yulia from taking out a mortgage on her apartment. After all, Lucy has a cunning plan on how to get an apartment without risks and overpayments. A friend follows Lucy's advice and ends up in prison, accused of murder. The fat woman, tormented by remorse, takes up her own investigation...