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Rimon Farris, a rich Sime farmer's son, has a golden future: all he has to do is marry his childhood sweetheart, Kadi, and he's set for life. But Kadi matures into a Gen, as one-third of the human children do, randomly; and suddenly is considered no more than a food animal, a thing to be killed and harvested. The couple refuse to accept their fate, and flee to a strange hybrid community. There they set in motion the greatest social engineering experiment in human history. If it succeeds, Simes will finally be able to live peacefully in a symbiotic relationship with the Gens. But if it fails, all will be lost...

The world of the Simes and Gens is teetering on the brink. Zeth Farris reaches adulthood just when things start to fall apart. When he finally understands the audacity of the social engineering experiment that his parents have set in motion, Zeth must build bridges with potential allies to hold the center together. But war comes anyway, and Zeth and his alliance must prevail. The price of failure--the destruction of his family, his culture, even his world!

When Sime killed Gen, it was the normal way of things--after all, Gens weren't really people, were they? They existed only to provide Simes with life-giving selyn. And then Risa Tigue, a Sime, injured and needing selyn, stumbles on the trail of a gen named Sergi ambrov Keon. Sergi is a companion, a Gen who can control the transfer of Selyn without harming either Sime or Gen. In Risa, Sergi sees the potential for that rarest of beings, a Channel. But can Risa survive the transformation--and even if she can, can Simes and Gens learn to live together peacefully? This is the legendary romance of Risa and Sergi.

The monumental social experiment begun in FIRST CHANNEL and continued in CHANNEL'S DESTINY culminates centuries later in ZELEROD'S DOOM.

Klyd Farris and Risa Tigue forge an alliance to reorganize both the Sime and Gen Territories, politically and economically. But both Territories have factions that are willing to battle each other, while the social fabric of their world falls apart. Still, Klyd and Risa have given their word of honor, and have no choice but to proceed--or perish while trying to avert... ZELEROD'S DOOM!