The other one is about zombies.
This one is about lots and lots of things:
But the real power of Martin's work arises from his extraordinary skill as a plotter. A Dance with Dragons follows, by my count, eleven major storylines, as well as assorted minor ones, each with its own rhythm, written in its own voice, and each playing off all the others. Martin will never win a Pulitzer or a National Book Award, but his skill as a crafter of narrative exceeds that of almost any literary novelist writing today.