After three very eventful episodes to start “Game of Thrones” Season 6, there has to be a point where the show slows down to focus on the aftermath of what has transpired in Westeros. Based on the “Game of Thrones” Season 6, episode 4 preview, “Book of the Stranger” may slow things down slightly while advancing the plot.

Warning: Full “Game of Thrones” Season 6 spoilers ahead.

Jon Snow’s resurrection and subsequent departure from Castle Black has serious implications for the Night’s Watch and what happens in the north. Jon Snow stated his watch has ended, but his next steps are uncertain. He could try to recruit the Wildlings to aid him in freeing Winterfell from the Boltons or he could head to the Vale in search of some familiar faces. The preview and released pictures do not offer many clues other than appearances by Dolorous Edd and Tormund Giantsbane.

Perhaps the most interesting moment from the “Game of Thrones” Season 6, episode 4 preview is the brief shot of Sansa Stark, Brienne and Podrick. There’s a massive gate that opens to reveal the trio, but there are no additional clues to let viewers know if they have arrived at Castle Black.

“Game of Thrones” previously teased two separate Stark reunions in the fourth season. The first involved Sansa and Arya in the Eyrie and another between Bran Stark and Jon Snow at Craster’s Keep. Hopefully the third time is the charm for a Stark reunion if Sansa is at Castle Black. Sansa could reveal the situation at Winterfell, which could spur Jon Snow into declaring war against the Boltons.

While one only can speculate on a potential encounter between Jon and Sansa, the “Book of the Stranger” preview does highlight two other reunions. Theon has returned to the Iron Isles, but Yara is not happy with her brother’s current condition. After being tortured by Ramsay Bolton, Theon is only just beginning to reassert himself as an individual. There’s also the unresolved matter of how Theon — in his broken state as Reek — refused to join her during Yara’s rescue attempt.

Jorah and Daario are plotting an attack on Vaes Dothrak to rescue Daenerys Targaryen. The duo may reunite with their queen, but Drogon, Daenerys’ dragon, which had missing since he landed in the Dothraki Sea, may also make his return. The reunion may be short-lived if speculation that Jorah dies during the rescue attempt proves correct.

Game of Thrones Season 6 episode 4 preview Littlefinger returns in “Game of Thrones” Season 6, episode 4, “Book of the Stranger.” Photo: HBO

Littlefinger makes his long awaited return in “Game of Thrones” Season 6, episode 4. He’s plotting something with young Robin Arryn. Littlefinger lets him know Sansa is on the run but is not safe, which could lead to the Vale getting involved in some way with what’s happening in the north. It could also be part of a larger Littlefinger plot as he previously made a deal with Cersei Lannister to become Warden of the North.

Diplomacy is another theme that will be featured heavily in this episode, according to the description for “Book of the Stranger.” “Tyrion (Peter Dinklage) strikes a deal. Jorah (Iain Glen) and Daario (Michiel Huisman) undertake a difficult task. Jaime (Nikolaj Coster-Waldau) and Cersei (Lena Headey) try to improve their situation,” reads the “Game of Thrones” Season 6, episode 4 synopsis.

Dorne is once again absent from the previews or released pictures, but it’s likely the show returns to Ellaria and the Sand Snakes in “Game of Thrones” Season 6, episode 4. After teasing the Tower of Joy in “Oathbreaker,” it’s unlikely the show returns to reveal what happens when Ned Stark meets his sister, Lyanna Stark.