Game of Thrones - Season 7 - Episode 4 - Part 1 - Book of the Stranger

Sansa arrives at Castle Black. Tyrion makes a deal with the slave masters. Jorah and Daario sneak into Vaes Dothrak. Ramsay sends a letter to Jon. Theon arrives at Pyke. Cersei and Olenna Tyrell plot against the High Sparrow.