The young scribe Iker has finally realised that in pursuing Pharaoh Sesostris with his hatred he chose the wrong target, and that the real enemy is elsewhere. Iker is now the Royal Son, a unique title bestowed on him by the pharaoh when he adopted him. The enemy, the one who is attacking the Tree of Life at Abydos is, in fact, the Herald, that baleful individual who is rallying troops on the borders in order to invade Egypt and annihilate her. Now Sesostris has just entrusted Iker with a particularly dangerous mission: to enter Canaan and discover the Herald's lair ...Who can save Egypt now? Sesostris - who is constantly having to withstand savage assassination attempts? Iker, who is fighting on a thousand fronts to prevent the traitor from succeeding? Or the beautiful priestess Isis, who perhaps - deep in her heart - will find the means to pacify the spirit of the Nile?