S. M Stirling

Young Rudi Mackenzie has grown up knowing that he will one day assume leadership over the Western Oregon survivors of the technological disaster called the Change. But a prophecy made at his birth spoke of an even greater destiny—a destiny that is about to be fulfilled.
           
A mysterious traveler has arrived in the Willamette Valley. He brings news from the East, from Nantucket...

“S. M. Stirling provides another fabulous postapocalyptic thriller to his Change saga.” – Alternative Worlds

Rudi Mackenzie traveled to Nantucket, where he found and took up the Sword of the Lady and, with it, his destiny. His return journey to the area known as Montival, in the Pacific Northwest, is a treacherous one since he and his companions must cross three thousand miles, making both allies and adversaries...

In this continuation of the bestselling author's chronicle of an alternate world, Rudi MacKenzie continues his trek across the land that was once the United States, where he hopes to learn the truth behind The Change that rendered technology across the globe inoperable.

Rudi Mackenzie has journeyed far across the land that was once the United States of America, hoping to find the source of the world-altering event that has come to be known as The Change. On the island of Nantucket he finds a beautifully made sword waiting for him--and once he takes it up, nothing will ever be the same.

Harry Turtledove hailed Island in the Sea of Time as “one of the best time travel/alternative history stories I’ve ever read,” and Jane Lindskold called Against the Tide of Years “another exciting and explosive tale.” Now the adventures of the Nantucket islanders lost in the time of the Bronze Age continues with On the Oceans of Eternity.
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Adrian Breze is more Shadowspawn than human, but he has turned from his own kind to fight for humanity. He battles the dark forces of the world, including those of his own blood ... including his sister twin anima.

Adrian Breze defied his own dark heritage as a near-purebred Shadowspawn for years, until his power-hungry sister Adrienne kidnapped his human lover Ellen. Now, Adrienne is dead, and the Council of Shadows is gathering its strength. To stop the Council from launching an apocalypse, Adrian and Ellen must ally with the Brotherhood, a resistance group dedicated to breaking the Council's hold on humankind...by any means necessary. In the coming confrontation,...

When a strange electrical storm over the island of Nantucket suddenly causes all electronic devices to cease to function, the world is faced with an unimaginable transformation.

The first novel in a brand-new alternate history series where Teddy Roosevelt is president for a second time right before WWI breaks out, and on his side is the Black Chamber, a secret spy network watching America's back.
1916. The Great War rages overseas, and the whole of Europe, Africa, and western Asia is falling to the Central Powers. To win a war that must be won, Teddy Roosevelt, once again the American president, turns to his top...

In the tenth year of the Change, the survivors in western Oregon have learned how to live in a world without technology. The city-state of Corvallis has preserved its university, and trade flourishes via riverboats and horse-drawn railways. Under the strong hand of Michael Havel, the Bearkillers hold the lands west of Salem in peace and order. And in the eastern half of the Willamette Valley, the Clan Mackenzie flourishes under the charismatic leadership...