Helius, Nero's most trusted adviser, anticipates the death of his sworn enemy, the legendary warrior Gallus Sergius Vitas, scheduled to die a gruesome death in the arena. However, the badly beaten man who appears in the amphitheater is not who he seems. Rescued by a stranger and given a mysterious scroll, Vitas is told he must decipher this letter to find the answers he needs—a letter that Helius is also determined to decipher and to keep hidden from Nero. As Nero's reign of terror grows, so does his circle of enemies.