Zoya works in the editorial office of the scientific journal Astronomy Today. She dreams of the same dream three times a year with enviable consistency. In this dream, she always sits surrounded by a strange company on the roof of some building and every time she wakes up with a headache. At the same time, a Catholic priest from Naborito Cathedral in Hiroshima, built on the site of a wooden church destroyed by a nuclear explosion on August 6, 1945, sees the same dreams. What is this? Coincidence? Zoya, together with her student friend Antonina, begins to conduct an unusual investigation. But only with the help of her ex-husband Damir and neighbor Uncle Zyama will she be able to complete this matter. She will understand that every person's life is unique, just like their DNA or fingerprints are unique. And also that life is a series of accidents that are intricately intertwined, causing bewilderment at the end result.