An unexpected revolt throws the balance of Ix into jeopardy and now Leto must make an important decision as the underground city is on the cusp of falling into evil hands. And while the Bene Gesserit's oracles predicted they would need a child from the Baron Harkonnen in order to continue tracing a genetic line to their foretold messiah... their plan has not gone as well as hoped. On the doorstep of Castle Caladan comes the man who will change everything - Duncan Idaho has arrived.