Blind Exodus - Evolution's Hand, #4

Dek Conrad thought Earth's politics were rough. Then he found the dead civilization at Ross 128. Having finally escaped Earth, Conrad landed in the Sirius system. He laid the groundwork for his secret plan to save humanity - only to discover that something had extinguished all intelligence life in the Ross 128 star system. The attack had happened just a few hundred years ago. And Ross 128 was practically next door to Sirius.
Conrad can't start new colonies with a threat like that unresolved. So, against the advice of his advisers, he led the expedition to Ross 128. It could be the worst, and last, mistake of his life.