The greatest mystery of the ancient world remains the identity of who set fire to the Great Library in Alexandria. One hundred years later, Heron of Alexandria-the city's most renown inventor and creator of Temple miracles-receives coin from a mysterious patron to investigate the crime. Desperate to be free of the debts incurred by her twin brother, she accepts and sets in motion a chain of events that will shake the Roman Empire and change the course of history forever.

For 300 years it was believed Alexander the Great had no heir. The Roman armada descends on Alexandria. Friends flee, allies bicker, and foes multiply in the night. The fragile city-state teeters on the brink of annihilation. As the naval blockade looms and palace intrigue thickens, Heron must find the heir of Alexander the Great or nothing will stop the Romans from overrunning the wondrous city.

The secrets of the pyramids have been lost for two thousand years. While Agog courts the Parthians, Heron plans to build the largest pyramid the world has ever seen to fulfill Alexander the Great's legacy. As Parthia's demands grow increasingly arduous, Heron's endeavors unleash hidden forces determined to destroy the fledgling pyramid and isolate the fragile city-state from gathering allies against Rome.

Two hundred years before the Alexandrian revolution, the inventor Archimedes created unimaginable weapons to defend the city-state of Syracuse from Rome. Now, the Alexandrians must contend with an enraged Roman Empire intent on destroying the technologically advanced upstart. While Agog takes his army of steam chariots north, Heron must investigate rumors of ancient weapons thought too destructive for the battlefield. As they speed towards conflict with the undefeated Roman Legion, the Alexandrian side must make a demanding sacrifice to survive.

One hundred years after the murder of Julius Caesar, the circumstances of his death could change the course of the fledgling Alexandrian Empire. Left in charge of the treacherous Roman Senate while Agog heads north to deal with the traitor Marcus, Heron finds the game of politics maddening. Her constant missteps encourage a growing list of enemies while a mysterious benefactor proves too dangerous to trust. As the city races towards a political showdown, Heron must discover the truth about the murder of Julius Caesar—a death witnessed by hundreds and understood by few—before a perilous vote hands power back to the Romans.

For thousands of years, myths have told the stories of the beasts at the edge of krakens, cyclops, even the fearsome dragon. Now, Heron of Alexandria must confront those myths aboard Hoth the Black's iron ship, the Jörmungandr, as they flee the remnants of the Roman navy bent on revenge. As she struggles to recover from her horrific injuries, and the repercussions of what happened in the Roman Senate, she must decide - once and forever - what she truly believes in.

The oldest mystery of the ancient world—one sought by kings and scholars alike—remains the secret of immortality. When Heron returns to Alexandria, she finds the High Priest of Sobek, Lysimachus, has wrested control of the great city of Alexandria from the nobles by demonstrating his mastery over death. Alone and in a city arrayed against her, Heron must find allies, rescue Sepharia from the clutches of the crocodile cult, and somehow find a way to overthrow Lysimachus from his iron-clad control of the city, otherwise she'll lose her beloved City of Wonders for eternity.