A teenager, in search of his place in the world, finds himself in a social network group that recruits children into a mysterious brotherhood. After going through a series of tests, teenagers must prove that they are special. The next task is a real murder. Having thought it over, the hero must escape from yesterday's "friends" and expose the real criminals.
"Your husband is sleeping with your student" – Olga finds such a note in one of the bouquets that were presented to her in honor of her triumphant speech at the scientific forum. Olga is a mathematician. She can easily figure out who sent this anonymous letter. Except this man is found dead. This is how a dangerous game begins, each move of which is associated with one of the Fibonacci numbers. What do they mean and how are they related to Olga's life? The answer is far in the past. Every mistake will cost the life of someone close to the heroine.
The elderly criminal authority Semyon Timofeevich Babushkin, about whose thieving talent legends were made up at the time, has not left prison for the last 35 years, preferring it to freedom, where he has no friends or relatives left.
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