Contains spoilers for this episode and earlier episodes.
Bran's group shelters in a mill near Jon and the wildlings. Hodor panics at the thunder, and Bran enters his mind to quiet him before the noise gives them away. The wildlings demand that Jon kill a captive horse breeder. Jon hesitates, and Ygritte kills the man instead. When the others turn on Jon, Bran enters Summer's mind and sends Summer into the fight. Jon kills Orell and escapes, leaving Ygritte behind. Bran sends Rickon and Osha toward Last Hearth while continuing north with the Reeds and Hodor. In Yunkai, Daario, Jorah and Grey Worm fight their way inside and secure the city for Daenerys.
At the Twins, Robb apologises to Walder Frey, and Edmure marries Roslin. After the newlyweds leave the feast, the doors close and the musicians play the Lannister song The Rains of Castamere. Catelyn discovers armour beneath Roose Bolton's clothes as the attack begins. Talisa is stabbed repeatedly, Robb is wounded by crossbow fire and Stark soldiers are slaughtered. Arya arrives with the Hound and sees soldiers and Grey Wind killed, but he knocks her unconscious and carries her away. Catelyn holds Walder's wife hostage and begs him to spare Robb. Roose kills Robb, and Catelyn cuts her hostage's throat. Black Walder then kills Catelyn, completing the massacre inside the hall.