Campbellian science fiction, especially hard science fiction, gets a hard time in the quarters I run in.  Epic fantasy is denigrated in favor of slim sword and sorcery paperbacks.  I like a good pulpy adventure as much as the next guy, but I refuse to give up on my original love, epic fantasy, or my more recent discovery, hard science fiction.  Detailed worldbuilding (for the former) and limits of the science (for the latter) can, in the hands of a skilled and careful storyteller, be a wonderful tool for creating and enhancing narrative tension.  Heinlein does this masterfully with the space suit in Have Space Suit—Will Travel.  Why do I mention this in a review about a zombie book?  Because I’ve been saying for years that zombie fiction should focus more on the difficulty of survival itself, turning a zombie yarn into as much survival fiction as horror.  That…