The Baratheon rivalry ends, driving Catelyn to flee and Littlefinger to act. At King’s Landing, Tyrion’s source alerts him to Joffrey’s defense plan - and a mysterious secret weapon. Theon sails to the Stony Shore to prove he’s worthy to be called Ironborn. At Harrenhal, Arya receives a promise from Jaqen H’ghar, one of the prisoners she saved from the Gold Cloaks. The Night’s Watch arrive at the Fist of the First Men, an ancient ringfort where they hope to stem the wildings' advance.
I give a low rating to this episode because of introduction of magic. Having fantasy elements is ok, so I'm perfectly ok with Dragons. Before this episode, this series was grounded in reality with actions having consequences. Having magic appear out of thin air that can kill anybody just cheapens the show and nothing has any weight anymore if anything can happen out of thin air.