Baku, Year 1920. Secret agent of the Emergency Commission Engineer Mammad Rustamov is sent to Berlin with a special assignment. On the pretext of treating his son's illness, Mammad is endangering his life and people around him.

In search of housing, a student stumbles upon an advertisement for renting an apartment at a very reasonable fee—and promptly agrees with a woman who recently laid her son to rest, complying with all her conditions. The young man settles into the apartment and gradually becomes a witness to inexplicable mystical phenomena.