The Secret Book is a Macedonian feature film combining the detective, thriller and conspiracy fiction genres, based on "Secret Book" (French: Le Livre Secret, Macedonian: Тајната книга), a real mystical book written by the Bogomils with Glagolitic letters (the first Slav alphabet, made by SS.
Bogomil ideas, carried back to France and Italy from the Balkans by refugees or returning crusaders in the 11th century, became the basis of the Cathar heresy.
Led by the strange messages from the Balkans brought to him by doves, he chooses his son Chevalier (Thierry Fremont) to search where he stopped.
The messages are sent from Macedonia by Pavle Bigorski, a man that identifying himself with the authentic author of "The Secret Book" from the Middle Ages.
Each brother represents some aspect of the Macedonian spirit (faith, rebellion towards the social evil, defense of honour).