"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.

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.

During an excursion to a research center, 17-year-old first-year student Zhenya accidentally gets into a test sample of a new model of the robot "Apostle" (A.P.O100L), which has its own will and mind. Having received a random pilot, the machine takes control and decides to escape from the laboratory. Now, in order to return home, Zhenya will have to find a common language with artificial intelligence.