1137. The Duke of Aquitaine—a region coveted by France—is found dead in Compostela. The body is dyed blue and bears the marks of the bloody eagle, an ancient Norman method of torture. The duke's daughter Eleonora decides to avenge her father's death and therefore marries the son of the man she believes murdered her father. That person is the King of France, Louis VI. Fat.
But the king himself dies under the same circumstances on the wedding day. Eleanor and Louis VII. together with the cats of Aquitaine - the legendary spies of the dukes - try to find out who wanted to put the inexperienced royal couple on the throne in his place. Many years before the death of the Duke of Aquitaine, a nameless boy is left in the forest. Maybe he is a monster, maybe a saint, but he manages to survive and become one of the most extraordinary men of medieval Europe. A riveting historical thriller, set in a century full of revenge, incest and battles, unravels a disturbing mystery around three heroes who will one day shape the future of Europe.