A Storm of Swords
"Mhysa" was written by executive producers David Benioff and D. B. Weiss, based on George R. R. Martin's original work from his novel "A Storm of Swords". Chapters adapted from "A Storm of Swords" to the episode were chapters 43, 49, 53 to 55, 57, 63, and 64 (Daenerys IV, Jon VI, Arya XI, Tyrion VI, Davos V, Bran IV, Jaime VII, Davos VI).