"A Feast for Crows" is the fourth book in George R.R. Martin's "A Song of Ice and Fire" series. It primarily focuses on the aftermath of the War of the Five Kings, with the realm in a state of chaos and power struggles intensifying. Key characters include Cersei Lannister, who seeks to consolidate her power in King's Landing; Jaime Lannister, who is on a journey to fulfill his own sense of honor; Brienne of Tarth, who is searching for the missing Sansa Stark; and the Greyjoys of the Iron Islands, who are vying for control. The novel delves into themes of political intrigue, loyalty, and the consequences of war, setting the stage for the further unraveling of the realm.