This amazing story tells about two worlds - dependent on each other. Despite the fact that the citizens of these worlds do not communicate or see each other, they are united by feelings - they equally experience joy and grief, injustice and fear, perseverance and betrayal, heroism and meanness. Their unique symbiosis helps them to exist. Two worlds in one - the world of people and the world of cells, of which the former are composed. One misfortune came to these worlds, bringing pain, fear and despair. The story is about repelling a dangerous threat and a mystery that connects both worlds. Where faith and hope for salvation were lost, the mystery of the infinity of worlds and the eternity of the universe is suddenly revealed. A 12-year-old boy is overcome by a malignant brain tumor (cancer): unbearable pain, memory loss, epileptic seizures. It seems that all paths to salvation are doomed. People and science are powerless. But there is a tiny and amazing world, similar to the human one, which is also desperately fighting a dangerous and ruthless enemy...