Lysa's letter

Lysa Arryn's letter is the hidden document that shatters the fragile peace of the Seven Kingdoms. Written in a private code the two sisters had devised as girls at Riverrun, concealed inside a carved wooden box containing a Myrish lens, and marked for Catelyn's eyes alone, the letter accuses the Lannisters—specifically Queen Cersei—of murdering Jon Arryn, the Hand of the King. It arrives at Winterfell on the same night King Robert Baratheon is a guest, and it forces Eddard Stark to accept the position of Hand and travel south, setting the entire tragedy of the book in motion.

Contents and Delivery

The letter is delivered by Maester Luwin, who found it hidden in a false bottom of the box that held the lens. The box itself had been left on a table in his observatory while he napped; no one saw who brought it, but it must have come from someone in the king's party, as Winterfell had no other visitors from the south. When Catelyn breaks the seal—blue wax stamped with the moon-and-falcon of House Arryn—the words at first make no sense to her. Then she remembers the private language she and Lysa had invented as girls. The letter is written in that code, and Catelyn must translate it aloud for Ned and Maester Luwin. The message is stark: "Lysa says Jon Arryn was murdered." When Ned asks by whom, Catelyn answers, "The Lannisters," and adds, "The queen."

Immediate Consequences

Catelyn burns the letter in the hearth, saying, "Lighting a fire," as she kneels over the cold hearth and slides the paper in among the kindling. The act is deliberate: she knows the letter would mean death if it fell into the wrong hands. Ned is initially skeptical, saying, "Your sister is sick with grief. She cannot know what she is saying." But Catelyn insists, "Lysa is impulsive, yes, but this message was carefully planned, cleverly hidden. She knew it meant death if her letter fell into the wrong hands. To risk so much, she must have had more than mere suspicion." The letter transforms the political landscape: Catelyn argues that Ned must now accept Robert's offer to become Hand, because only from that position can he discover the truth. "Now we truly have no choice. You must be Robert's Hand. You must go south with him and learn the truth." Ned, who had been determined to refuse, is forced to yield.

The Letter's Role in the Larger Conspiracy

The letter is the first explicit accusation of Lannister treachery in the book, and it becomes the foundation for the Stark-Tully alliance against the crown. It is also the document that Catelyn later uses to justify her seizure of Tyrion Lannister at the Crossroads Inn, an act that triggers open war. The letter's existence is known to Petyr Baelish, who helped conceal Catelyn's presence in King's Landing and who later uses the information to manipulate events. The letter's coded nature and its secret delivery underscore the theme of hidden knowledge and the danger of truth in a world where "dark wings, dark words" are the norm. It is a private warning that becomes a public casus belli, and its contents—the accusation of Lannister murder—are never fully proven in the book, leaving the question of Jon Arryn's death as a lingering mystery that drives the plot forward.