Many stories about secret detectives from the Echo have been told; even more stories remain the common heritage of the author and the characters. Some things that have been buried until now under the stamp "Top Secret", the past of the Kettarian Hunter and his senior comrades, the memories of the employees of the Secret Search and a great many other events - all these stories have long awaited their time. It would be possible to keep silent further, but the narrator does not want all these beautiful things that he saw - whether in reality, in a dream, "on the border between light and shadow" - disappeared forever, dissolved in the dark, under his closed eyelids. Therefore, old friends get together, on a remote island, where ten days a year, while the wind of Hababur blows, absolutely everything is possible. Even the impossible .