Sixth-grader Vitya Kornitsov, who was nicknamed Spinoza for his intelligence, loves to experiment. In a children's sandbox, he built a pyramid, which unexpectedly became a portal to other worlds. It was through these gates that Spinoza himself, his friend and classmate Katya Volosyuk, nicknamed Hercules, poor student Boniface Petulya and the class teacher Mary Ivanna, who was chasing after him, whom everyone at school calls Karga, entered Ancient Egypt. Gods and pharaohs, ordinary people and prophets, adults and children, fictional and real historical figures - they are all heroes of this book, which will be interesting to both children and adults.