S2E5 · The Ghost of Harrenhal

Complete story — includes the ending

At Harrenhal, Jaqen H'ghar, a Faceless Man, assassin, and one of three caged prisoners Arya previously saved from a fire, pledges to kill any three people she chooses to repay his debt to her. Her first choice is "the Tickler", the man who mortally tortures the captives. Renly is killed by Melisandre's shadowy assassin. Brienne is accused of the murder, and Catelyn forces her to flee the camp. Excluding the Tyrells, Renly's forces join Stannis. Brienne swears lifelong fealty to Catelyn for having saved her life. Theon sails from Pyke, and against Yara's orders, intends to prove he is a true Ironborn by capturing Winterfell during Robb's absence. Lancel tells Tyrion about wildfire, a mass-produced explosive substance hidden in the city's dungeons and intended to destroy Stannis's fleet and army during the impending siege. Tyrion then takes control of the scheme. In the North, the Night's Watch arrives at an ancient fortress called the Fist of the First Men. Jeor Mormont hands command of Jon over to legendary ranger Qhorin Halfhand, who is leading a team to the Frostfang mountains to spy on the gathering wildling host. In Qarth, Xaro proposes marriage to Daenerys in exchange for providing her with his wealth to conquer the Seven Kingdoms. Ser Jorah Mormont convinces her to gain the Westerosi peoples' support instead.