Twelve-year-old Iwo lives in a small, post-communist town that is home to the old and destroyed Black Mill – once a place of work for many parents. Breaking the promise to not approach the old mill, the children accidentally unleash its evil powers. From that moment, nothing will ever be the same again as people and things start to disappear.

During a hot holiday in the countryside, the close relationship of teenage siblings is put to the test. Charmed by her younger brother, Ania fights for his affection.