Game of Thrones - Season 7, Episode 1 Synopsis
 

Episode 7 - 1
Title: "Dragonstone"
Directed by Jeremy Podeswa
Written by David Benioff & D. B. Weiss
Original Air Date - July 16, 2017

At the Twins, Arya, disguised as Walder Frey, poisons the remaining lords of House Frey. The White Walkers march toward the Wall, where Tollett allows Bran and Meera to enter. At Winterfell, despite Sansa's disapproval, Jon secures the loyalties of Houses Umber and Karstark, who fought alongside Ramsay in the Battle of the Bastards. At the Citadel, Samwell secretly borrows library books, one of which reveals a large deposit of dragonglass in Dragonstone, and sends word to Jon. Sam later finds Ser Jorah, now heavily infected with greyscale, quarantined in a cell. In the Riverlands, Arya meets some friendly Lannister soldiers, who consider her declared intention to kill Cersei as a joke. Thoros shows Sandor a vision of the Wall and the marching Army of the Dead in the fire. The revelation leads him to believe in the Lord of Light. In King's Landing, Jaime tells Cersei allies are crucially needed. She receives Euron, who proposes marriage in exchange for his Iron Fleet and an opportunity to kill Theon and Yara. Cersei declines, citing trust as a concern, so Euron promises to return with a "gift" to prove his loyalty. Daenerys arrives at Dragonstone, the home of House Targaryen, previously occupied by Stannis Baratheon, with her army and dragons.


Source: https://en.wikipedia.org/wiki/Game_of_Thrones_(season_7)