To save the world from an alien invasion, humanity had altered its children's genetic code--and is now paying the price. Earth's younger generations are dying of a new disease. Salvation may lie in outer space, in the DNA of humans who founded colonies before the alien attack. That is, if Earth's settlers can be found.
Used availability for Hilari Bell's Navohar
June 2000 : USA Mass Market Paperback
April 2015 : USA, Canada, UK Kindle edition