Olga and Masha are twin sisters.

On this day the sisters went to walk around the city.
They did not notice how they went to the outskirts of the city.
In old industrial zone.

Olga wanted to urinate and went to some abandoned building.
Masha waited for her outside, she was talking on a cell phone.

She is tired of waiting, she enters the building and sees her sister's corpse....
At this time the maniac attacked her from behind...