A girl, Kalina, who lives in Belarus spends summer vacation at grandma's house in rural area. They village is very close to the area prohibited to reside because of radioactive contamination. Kalina's family had lived there, but they break up in the attack of mom. Dad moved in far-off Moscow to earn the hospital charges for Mon. One day, hospitalized Mon tells Kalina 'There is a castle of devils in a town called Chernobyl. They are spreading out poisons.' Kalina tells grandma it. She laughs and says 'God will attack them.' However, grandma gets sick, and mom's condition has deteriorated. Kalina wonders why God wouldn't help her. 'If god wouldn't do anything, I do by myself' Kalina decides to go to Chernobyl.