How are the mysterious murder of a student and activist of an opposition youth group and the long-ago death of a teenager under the wheels of an electric train connected? Forty years separate these tragedies, but something unites them, and the successful director of the library, who unexpectedly finds himself in the thick of events, has to understand this. Maxim Zamshev's novel is full of secrets, but it is not just a detective story with an unexpected ending, but a book seeking answers to the most pressing questions of our time.