Watch Game of Thrones Season 4 Episode 4
Sansa comes to learn that Lord Baelish was partly responsible for killing Joffrey. Margaery seeks counsel of her grandmother Olenna who asks her to shift her attention to Tommen since Joffrey is now dead. Cersei on the other hands continues to push Jaime on her woes, insisting that both Sansa and Tyrion must die. Jaime, however, believes that Tyrion is innocent and thus sends Lady Brienne to locate Sansa and provide her with protection.
Meanwhile at Castle Black, Alliser sends Jon Snow to go beyond the wall with his ‘blessings’ to kill the mutineers, with the hope that this will get him rid of Jon Snow forever. This is where we learn that the mutineers keep sacrificing baby-boys to the White Walkers, and later it is also revealed that these babies in fact become a part of the White Walker army.