Together, they dig through the mortar using a spoon. Mira escapes into the rain, runs until her feet bleed, and delivers R5 — from memory — to the one person who might believe her: (still alive, still hiding in the Neck).

Mira flees Harrenhal with the message, hoping to sell it to the Starks’ remaining allies. She crosses paths with (still with the Hound) near the Twins. Arya, barely recognizable, doesn’t trust her — until Mira whispers: “The Lannisters know Robb is vulnerable. They’re planning a massacre at a wedding.”

Mira doesn’t know it yet, but R5 is a Lannister contingency plan: — but only after the Red Wedding. The “fifth raven” refers to a spy inside Robb’s camp confirming that Jeyne Westerling is not pregnant, and that Bran and Rickon are presumed dead.