Dune: The Machine Crusade : DUNE: Legends of Dune Book 2 (DUNE: Legends of Dune‪)‬

The first battle was a victory. But the war is just beginning . . .
Earth is a radioactive ruin. But the initial campaign of the Butlerian Jihad has given new hope to mankind. Serena Butler, whose murdered child has become a symbol for oppressed humanity, inspires a war against the thinking computers led by Xavier Harkonnen and Vorian Atreides. But four of the Titans – murderous machines with human brains and human cunning – still remain. And the universal computer mind, Omnius, still wields most of its power.
‘Such vile villains...and such a fascinating description of splendid places.' Anne McCaffrey on HOUSE HARKONNEN