Orson Scott Card
1) Magic street
2) Earth afire
George Galen is a brilliant scientist, a pioneer in gene therapy. But Galen is dangerously insane. He has created a method to alter human DNA, not just to heal diseases but also to "improve people": make them stronger, make them able to heal more quickly...and make them compliant to his will.
Frank Hartman is also a brilliant virologist, working for the government's ultra-secret biohazard agency. He has discovered how to neutralize Galen's
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