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  ===Critical reception===
  "Book of the Stranger" received universal praise from critics, with many citing the reunion of Jon Snow and Sansa Stark, the final scene involving Daenerys Targaryen killing the leaders of the khalasar, and the forward moving storytelling as strong points for the episode. On review aggregator website Rotten Tomatoes, the episode has an approval rating of 100% based on 63 reviews, with an average rating of 8.79/10. The website's critical consensus reads, ""Book of the Stranger"'s warm reunions, new alliances, and exquisitely fiery finale is ''Game of Thrones'' at its best." It is the highest-rated ''Game of Thrones'' episode on the website.
  In a review for IGN, Matt Fowler wrote of the episode, ""Book of the Stranger" handed us two very lovely, satisfying moments with the Stark/Snow reunion at Castle Black (and the subsequent vow to defeat Ramsay and rescue Rickon) and Daenerys's conquering of Vaes Dothrak. Both were huge, forward-moving story elements that harkened back to Season 1 and gave viewers something to root for and grab onto as the show itself heads into its final arcs." Fowler also noted, "As a reader of the books with no more books to read, Season 6 has been a very interesting experience," giving the episode a 9.2 out of 10. Jeremy Egner of ''The New York Times'' also praised the scenes at Castle Black and in Vaes Dothrak, writing "''Game of Thrones'' lived up to its billing as ''A Song of Ice and Fire'' on Sunday, as there was plenty of action in both of the signature halves of the story." Brandon Nowalk of ''The A.V. Club'' wrote, "Now that is how you set the table. "Book Of The Stranger" doesn't just check off plot points. In fact, there aren't a lot of plot points to check off. It's an episode of introductions, reunions, and wall-to-wall scheming," giving the episode an A. Eliana Dockterman of ''Time'' wrote about the strong female storylines in the episode, stating "The creators of ''Game of Thrones'' have been touting the sixth season of the show as the year when women finally wreak vengeance. The fourth episode, "Book of the Stranger," suggests that they will hold true to their word."