A Storm of Swords 2: Blood and Gold by George R.R. Martin

Robb Stark may be King in the North, but he must bend to the will of the old tyrant Walder Frey if he is to hold his crown. And while his youngest sister, Arya, has escaped the clutches of the depraved Cersei Lannister and her son, the capricious boy-king Joffrey, Sansa Stark remains their captive.

Meanwhile, across the ocean, Daenerys Stormborn, the last heir of the Dragon King, delivers death to the slave-trading cities of Astapor and Yunkai as she approaches Westeros with vengeance in her heart.