Division at night

There were many strange people in Boris Pavlovich’s life. But among them were their unique ones. How, for example, that unknown, who called from an unfamiliar number and asked a very extraordinary question: "Do you want to provide the greatest service to the Lord?"
It soon turns out that the caller is the father of one of the students of Boris Pavlovich. According to him, the guy disappeared. According to the official version, Alyosha drowned during a vacation in Egypt, but they never found the body. Father is sure that something is unclean in this disappearance. However, he turned to Boris Pavlovich not quite to find his son. Its goal is to gain access to Alyosha’s laptop, learning the password.
Boris Belkin is not a cryptograph and not a mathematician. He is just a teacher of philosophy, who really did not know the missing student. But, perhaps, it is Boris Pavlovich who is the person who can solve the course of thoughts of the young man. And then, perhaps, it will be possible to understand what really happened. Or the father does not speak and tries to find out what he should not know