Decision at DoonaBy: Anne McCaffrey Series: Doona A fateful encounter between star roving races by the author of the bestselling Dragonriders of Pern series! After the first human contact with the Siwannese, that entire race committed mass suicide. So the Terran government made a lawno further contact would be allowed with sentient creatures anywhere in the galaxy. Therefore Doona could be colonized only if an official survey established that the planet was both