Mathematics teacher Alexander was lucky to get into the ranks of people who call themselves "cogitators". For centuries, they have governed the course of world events to avoid the collapse of civilization. The Cogitators struggle with ideas. Ideas that can destroy civilization from within. The task is complicated by the fact that the new "work" must somehow be combined with personal life. Having struck up a relationship with her student Angelica, Alexander cannot in any way throw her new companion out of the head of the mysterious Agnia. But there is no time for mental reflection when news of a new idea appears. It is capable of putting a greasy point on the existence of all mankind.