Tomek lives only with his mother, because his father, Alek, left for the USA to earn some money. Unexpectedly, the man arrives home with a bunch of presents but no explanation as to why he has come back. Everybody seems happy but something is in the air.
When someone brings a mask and a crossbow to a party instead of chips, the carefree night turns into a fight for survival. Technology fails – the murderer takes control of the security system. Doors close, windows lock, and the house turns into a prison.
A group of five kindergartners are kidnapped. Meanwhile, geologist Lena and her colleagues prepare for a scientific expedition to Antarctica. When it turns out that the suspect in the kidnapping is Ada, Lena's teenage daughter, the mother postpones her professional plans and returns to her hometown of Wałbrzych to find her daughter, with whom she lost contact many years ago.
