A Clash of Kings (A Song of Ice and Fire, Book 2) by George R. R. Martin
George R.R. Martin is the globally bestselling author of many fine novels, including A Game of Thrones, A Clash of Kings, A Storm of Swords, A Feast for Crows, and A Dance with Dragons, which together make up the series A Song of Ice and Fire, on which HBO based the world's most-watched television series, Game of Thrones.
A Clash of Kings picks up the story where A Game of Thrones leaves off. The Seven Kingdoms are plagued by civil war, the Night's Watch mounts a reconnaissance force north of the Wall, and in the distant east, Daenerys Targaryen continues her quest to return to the Seven Kingdoms and claim her birthright.