During the Macedonian Struggle (1904-1908), the swampy lake of Giannitsa was one of the main theaters of fierce Greek-Bulgarian clashes in Macedonia, which was part of the Ottoman Empire.

In the classic historical novel "In the Secrets of the Swamp" (1937), the emblematic children’s literature author Penelope Delta depicts the dramatic events of the era, skillfully combining the power of authentic historical material with the intensity of fiction.

The narrative unfolds around the actions of two children, Apostolis and Giovan, who assist the Greek guerrilla forces in their operations against the Bulgarian units, while also following the struggle of Tellos Agras (Sarandos Agapinos) and Captain Nikiforos (Ioannis Demestichas), prominent historical figures of that period.

The archetypal swamp landscape, acts of heroism, the feeling of patriotism, moments of humanity, but also betrayals, personal dramas an...