Lo que pasa en Harrenhal en el capitulo, relatado al detalle (de westeros.org)
Es puramente un resumen del capitulo (nada relacionado con los libros):
The long train of the northern host approaches Harrenhal. Robb Stark is advised by Roose to set the siege lines a thousand yards away, but Robb believes there’ll be no siege as the Mountain won’t defend a ruin. Roose says that he images the Mountain would defend whatever Lord Tywin told him to defend… but Robb notes the Lannisters have deliberately avoided fighting him ever since Oxcross. He and his men would love a fight, but they’ve been denied that and he doesn’t believe that will change.
Inside Harrenhal there is an abattoir. Over two hundred northmen prisoners have been murdered when Clegane abandoned the seat. Roose Bolton and Rickard Karstark stand side by side, looking at it all. Roose says that the debt will be repaid, for them and for his sons. Rickard questions it, saying they’re rotting in the ground while their killer—Jaime Lannister—roams free… and he does so while looking at Catelyn Stark as she sees the slaughter. Roose says he won’t be free for long, as he has one of his best hunters after them.
Catelyn moves among the dead and then recognizes Ser Jeremy Mallister, one of her father’s vassals. Rickard Karstark leaves angrily, while Roose slowly follows. The northmen watch him, staring, and Robb commands that Catelyn be taken to a chamber that will serve as a cell. Talisa comes up to Robb as Catelyn is carried away, and reminds him that she’s his mother. To this, Robb replies that she freed Jaime; the Lannisters robbed them of their sons and she robbed them of their justice. Just then, one of the men on the ground coughs, still alive. He wears robes like a maester’s, but has no chain. Talisa tends to him as he reveals his name is Qyburn. Talisa says he’s lucky to be alive… and he asks, wearily, “Lucky?”