“Today, in a herd of dolphins swimming somewhere in the endless sea, a significant event has occurred: the time has come when the males must leave the general herd. And they will be led - by the decision of the elders - by Hooke, who from today becomes the head of the herd and a member of the council of elders of the Err clan.” Thus ends the amazing adventures of the dolphin Hooke, in which he grew up and matured. The reader will learn a lot about the life of dolphins, about the characteristics of their body, and will become acquainted with many of the sea inhabitants that Guk had to meet.