About twenty years ago I found Robert Shea's Shike books on dads bookshelf.
An utterly riveting read, but sadly out of print for a very long time.
Quite by chance I wanted to see if it was available as an epub, and it turns out his son released it under Creative Commons license.
Go read it. Now!
http://www.manybooks.net/titles/shearother08shike.html
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