Thirty years earlier, Edmond de Luna had set sail from Barcelona, bound for the East, in search of wonders and adventures. His sea voyage had taken him to forbidden islands that did not appear on navigation charts, to lie with princesses and creatures of an unmentionable nature, to learn secrets of civilizations buried by time and to initiate himself in the science and art of building labyrinths, a talent that would make him famous and provide him with employment and fortune at the service of sultans and emperors. As the years went by, the accumulation of pleasure and wealth no longer meant anything to him. He had satisfied greed and ambition beyond the dreams of any mortal, and upon reaching maturity, aware that he was fast approaching the twilight of his life, he told himself that he would never again offer his services to anyone unless it were in exchange for the greatest of rewards: forbidden knowledge. For years he refused invitations to build the most prodigious and intricate labyrinths because nothing offered in payment seemed desirable to him. He thought there could be no treasure in the world that had not already been presented to him, when news came that the Emperor of the city of Constantinople required his services, for which he was prepared to reward him with a thousand-year-old secret to which no living soul had been privy for centuries. Bored and tempted by a last opportunity to revive the flame of his soul, Edmond de Luna visited Emperor Constantine in his palace. Constantine was utterly convinced that sooner or later the siege of the Ottoman sultans would bring his empire to an end and all the knowledge that the city of Constantinople had built up over the centuries would be banished from the face of the earth. He therefore wanted Edmond to plan the greatest labyrinth ever created, a secret library, a city of books hidden beneath the catacombs of the cathedral of Hagia Sophia, where forbidden works and the prodigies of centuries of thoughts could be preserved forever. In exchange, Emperor Constantine offered Edmond no treasure, but only a flask: a small cut-glass phial containing a scarlet liquid that shone in the dark. Constantine smiled strangely as he showed Edmond the bottle. ‘I’ve waited many years to find a man worthy of this gift,’ the emperor explained. ‘In the wrong hands, this could be an instrument for evil.’ Fascinated and intrigued, Edmond examined the bottle. ‘It’s a drop of blood from the last dragon,’ murmured the emperor. ‘The secret of immortality.’