In 12 BC, Marcus Aemilius Lepidus, the Pontifex of Rome, and Agrippa, the politician appointed by the powerful Emperor Augustus as his successor, are mysteriously killed by eagles that tear apart their entrails. Disturbed by these incidents, Augustus commissions his old friend, Senator Alix Gracchus, to discreetly investigate the cases. This investigation, supported by his sons Titus and Kephren (the biological son of Enak, whom Alix adopted after his death), leads Alix on the trail of the enigmatic Lord of the Birds. However, the danger is far from over; it now even threatens the Emperor himself. Ultimately, Alix will discover that the most dangerous predator hides in the heart of Rome, where no one would have suspected. A new chapter opens for the famous Roman boy Alix, created by Jacques Martin, as he matures into a senator.