Dune: House Harkonnen (Dune: House Harkonnen #2)

While Gurney sings blasphemous songs in defiance of the Baron, who grows weaker from his stubborn affliction by the day, the fruitless production of artificial spice continues to infuriate Fenring and Shaddam, and a hidden stash of organic spice further complicates things.

Meanwhile, Duke Leto is watched from afar by a person of untold significance for his future and lineage...