• Sansa Stark (Sophie Turner) arrives at Winterfell in the HBO series "Game of Thrones" Season 4.

Sansa Stark (Sophie Turner) arrives at Winterfell in the HBO series "Game of Thrones" Season 4. (Photo : YouTube/GoT)

Crucial details from the hotly-anticipated "Game of Thrones" Season 6 episode 4 have been revealed by HBO. Apart from the 35-second preview, the network has also released seven promotional stills from the upcoming episode that will be aired on May 15, Sunday.

"Game of Thrones" Season 6 episode 4 will be titled "Book of the Stranger." Going by the title, the upcoming episode is likely to be centered on one of the seven Gods of Westeros, "The Stranger." Official synopsis, as released by HBO, for the upcoming episode is given below:

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"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."

The upcoming episode is written by David Benioff and D. B. Weiss. It  is directed by Dan Sackheim. This episode will feature the first season 6 sighting of Petyr "Littlefinger" Baelish (Aidan Gillen) who will be seen returning to the Riverlands to probably tell the Tully family of Sansa's escape from Winterfell.

In the preview, a glimpse of Theon Greyjoy (Alfie Allen) can be seen reuniting with his sister Yara Greyjoy (Gemma Whalen) following their father's death in last week's episode. Another brother-sister reunion in waiting is those of Sansa Stark (Sophie Turner) and Jon Snow (Kit Harington). The former has seemingly arrived at The Wall. However, it is highly possible that Snow has already embarked on a journey back to Winterfell and the two are unlikely to meet so soon.

Also, some casualties are anticipated as Jorah and Daario attempt to rescue Daenerys (Emilia Clarke) from her latest predicament. The latter is also seen in one of the promotional stills, in which she is seen sitting with Dosh Khaleen Priestess (Souad Faress). Back in Meereen, the city's residents are seemingly growing ever-more frustrated at Daenerys' absence, a situation which Tyrion and Varys are handling tactfully.

Earlier, Clarke dished on the pressure she faces when it comes to portraying her beloved Khaleesi character during an interview with Vogue Australia when she said that she was extremely nervous to play the role. Talking about  infamous blond locks, the actress told the publication that  "diehard fans" can recognize her without the cascading wig.

Meanwhile, watch "Game of Thrones" Season 6 episode 4 preview below: