Trapped within the dead city of Marandur, Master Mechanic Mari and Mage Alain must escape both merciless barbarians and the pitiless Imperial Legion. Beyond those dangers lie the mightiest and most unforgiving powers in the world of Dematr: the Great Guilds that rule the world with iron fists. Mari's Mechanics Guild and Alain's Mage Guild have always been enemies, but they are united in wanting to kill their rogue members before Mari can fulfill the ancient prophecy of being the one who will finally overthrow their power. Mari and Alain must risk those dangers because halfway across their world lies a place where truth has long been hidden. A place that could explain why their world's history begins abruptly, with no hints of what came before. A place where they might learn how the Mechanics Guild came to control all technology and how the Mages manage to alter reality temporarily. A place that might tell them how to achieve a task that appears to be impossible. Never before have a Mage and a Mechanic worked together, and their combined talents offer their only hope. But she and Alain must first survive the deadly and implacable Assassins of Altis.

Dematr is a world ruled by the diametrically opposed Mage and Mechanic Guilds. For centuries, the two Great Guilds have been bitter rivals. But now a Storm approaches, one that could sweep away everything that humans have built. Only one person has any chance of uniting enough of the world behind to stop the Storm. Mari is a brilliant young Mechanic, just out of the Guild Halls, where she has spent most of her life learning how to run the steam locomotives and other devices of her Guild. Alain is the youngest Mage ever to learn how to change the world he sees with the power of his mind. Each has been taught that the works of the other's Guild are frauds. But when their caravan is destroyed, they must join forces. Their union could save the world from the approaching Storm, but it could also upend the Great Guilds who will stop at nothing to preserve their power. Mari and Alain will have to choose between protecting their lives and their Guilds, or risking everything to protect Dematr from the coming Storm.

When Master Mechanic Mari and Mage Alain took down the Dark Mechanics and Dark Mages at Dorcastle, they thought they’d covered their involvement well enough to divert their Guilds’ suspicions. The assassins sent after them by their Guilds, which had trained them from childhood, indicate otherwise. Armed with the knowledge that their respective Guilds are now trying to kill them, and knowing their strengths are greater together, they reunite. Rumor has it the key to saving their world from the Guilds’ iron-fisted rule is in the dead city of Marandur. But before they can even attempt to traverse the empty wastelands and avoid the imperial guards surrounding Marandur, they’ll have to survive the Guilds’ agents, who are determined to capture them at any cost, and by any means necessary.

A Storm that will wreck a world threatens Dematr. Only Mari, one of the Mechanics who control all technology through their Guild, has a chance to stop it. She and Mage Alain have survived numerous attempts to kill them and have gained many more followers, but the Storm of chaos, born of centuries of enslavement, grows ever closer. Mari leads an army now. She and Alain must fight together to bind back the Broken Kingdom and build a force strong enough to defeat the might of the Great Guilds. But the Storm has many Servants who seek to preserve or gain personal power or wealth, or fear the New Day that Mari seeks to bring to the world. And Mari knows that victory will mean nothing if the precious knowledge brought long ago to their world is destroyed. In order to save it, Alain and Mari will have to pierce through the heart of their enemies' power and confront once more a place of ancient nightmare.

"The world feels oddly strained, like a line pulled too taunt and apt to snap, smashing everything in its path." Master Mechanic Mari and Mage Alain have survived every attempt to stop them, but their enemies are determined to kill Mari, the only one who can save her world from a storm of destruction. As armies begin to gather and cities seethe with tension, Mari, Alain, and their friends must prepare to confront the storm in the place it first appeared: the broken kingdom of Tiae. The dangers facing them demand perilous raids, tough battles, and more than a little piracy. Beating the Mechanics Guild and the Mage Guild that have controlled the world of Dematr for centuries will require an unprecedented alliance under Mari's command of rebellious Mechanics, Mages, and common folk who know that together they can change the world, but separately they will all lose.

New York Times best-selling author Jack Campbell's epic series, The Pillars of Reality, reaches its exciting conclusion. The Great Guilds, fearing the loss of their control of the world of Dematr, have gathered their power and joined it with the relentless legions of the Empire. The full might of that host will fall upon the fortress city of Dorcastle. If Dorcastle falls, the revolt led by Master Mechanic Mari and Mage Alain will fail, and their world will soon descend into chaos. Only Mari, believed to be the daughter of an ancient prophecy, can inspire the people and lead the defense of Dorcastle. The prophecy says she has a chance to win, but it doesn't say she will survive. Alain will stand by her, both willing to die for the other, but neither one knows if their sacrifices will mean victory. As they battle the Imperial legions and see friends fall, Mari and Alain face their greatest challenges. And if they somehow win in the face of impossible odds, neither one can be certain what sort of world that victory will produce.

The legacy of Mari and Alain blazes ahead in this brand-new sequel to The Pillars of Reality series. The Great Guilds had conspired for centuries to keep Dematr unchanged. The Mechanics Guild kept secret the technolgy for steam locomotion, rifles, and far-talkers, leaving most people to live in a world of oil lamps, crossbows, and horse cavalry, while the Mages treated all others as if they were nothing — until Master Mechanic Mari, dragon slayer and pirate queen, and Master of Mages Alain raised the army of the new day to free their world. Kira of Pacta Servanda, the daughter of the two greatest heroes of her world, was six years old the day she stood on a battlement in Dorcastle, kept safe from the nearby crowds by bodyguards as she stared up at a statue of her mother. As the morning sun cast the shadow of Mari’s statue over Kira, she realized that she would spend the rest of her life in that shade. Then the world of Dematr learned that a new kind of ship had left the far-distant world of Urth. The ship would take just 10 years to cover the immense distances between stars. Of all the colony worlds, the ship was coming to Dematr. But for what purpose? Kira was 16 when the ship from Urth arrived, and she discovered that her world still needed heroes.