The theme of this book is the Macedonian Struggle, particularly the phase that directly concerns the lake of Giannitsa, the Swamp. Its writing took several years because Penelope S. Delta, in order to complete the work she set for herself, first had to collect a large volume and quantity of material. The heroes include, apart from historical figures, two children, Giovan and Apostolis, who are partly protagonists of the book. [Excerpt from the text on the back cover of the edition]