Seven noble families fight for control of the mythical land of Westeros. Political and sexual intrigue is pervasive. Robert Baratheon, King of Westeros, asks his old friend Eddard, Lord Stark, to serve as Hand of the King, or highest official. Secretly warned that the previous Hand was assassinated, Eddard accepts in order to investigate further. Meanwhile the Queen's family, the Lannisters, may be hatching a plot to take power. Across the sea, the last members of the previous and deposed ruling family, the Targaryens, are also scheming to regain the throne. The friction between the houses Stark, Lannister and Baratheon, and with the remaining great houses Greyjoy, Tully, Arryn, and Tyrell, leads to full-scale war. All while a very ancient evil awakens in the farthest north. Amidst the war and political confusion, a neglected military order of misfits, the Night's Watch, is all that stands between the realms of men and icy horrors beyond.

When Briony Tallis, 13 years old and an aspiring writer, sees her older sister Cecilia and Robbie Turner at the fountain in front of the family estate she misinterprets what is happening thus setting into motion a series of misunderstandings and a childish pique that will have lasting repercussions for all of them. Robbie is the son of a family servant toward whom the family has always been kind. They paid for his time at Cambridge and now he plans on going to medical school. After the fountain incident, Briony reads a letter intended for Cecilia and concludes that Robbie is a deviant. When her cousin Lola is raped, she tells the police that it was Robbie she saw committing the deed.