The secrets of the seaside village. A brief course for a scout.

In the village on the Black Sea coast, where the heroes of the book Yurka, Kostya, Olga, and Dimka met and became friends, new vacationers appear - a father and his daughter Marina. Their behavior raises suspicion from Yurka, a connoisseur of books and movies about spies and intelligence agents.

The kids start to watch the newcomers, not realizing that this is the beginning of exciting adventures, during which they will not only uncover the secret of Marina's father but also learn a lot about the history of intelligence from ancient times to the present day, about the lives of outstanding spies, and about the qualities one must possess to succeed in such a challenging field.

The heroes and readers of the book will have to complete many tasks that contribute to the development of logical thinking, memory, attention, observation, and other qualities. Some of the educational material is presented in the form of audio supplements accessible via QR codes.