The peace of the tenement house residents in Warsaw's Mokotów district is disturbed by the appearance of a new owner of the building. With increasing repressions, the man begins to force more families to move out. The last and most stubborn tenant is cruelly murdered. The police investigation has failed. After some time, they are taken over by a young, ambitious officer - Anna Szerucka. Clues lead the woman to a plot in which officials, service people and high-ranking members of the bar are involved.