Infiltrator (Star Trek: The Next Generation, Book 42)
Centuries ago, followers of the tyrant Khan Noonien Singh left Earth for the  planet Hera to continue his experiment in selective breeding. Now, they are  finally ready to launch their plan of universal domination -- with theU.S.S. EnterpriseTMas their weapon.  Captain Picard must enlist the help of Heran expatriate Astrid Kemal to defeat  her fellow superbeings. Unless the captain and crew of theEnterprisecan stop them, the Heran infiltrators could alter the genetic landscape of the  galaxy for generations to come.