SPOILERS! DO NOT READ ON IF YOU HAVE NOT SEEN THIS SEASON!
Here's a little summary to refresh your memory:
-The season opens up with where the season 5 finale ended: Jon's lifeless body is laying in the snow. Within a few minutes Ghost, his direwolf, started mourning which alerted his remaining friends, including Ser Davos.
-Melisandre (the red witch) is worried for the future because she claims to have seen Jon Snow in the flames fighting at Winterfell.
-Ramsey Bolton is sad about the loss of Myranda who he has known since he was 11. In a few more words he mentions that her death will not be in vain then feeds her corpse to his dogs.
-Sansa and Theon Greyjoy are running for their lives as Ramsey's dogs are on their trail. They don't get very far before the dogs catch up to them but they are saved by Brienne and Podrick Payne on horseback. Once Ramsey's men are defeated, Brienne pledges her loyalty and protection to Sansa, and she accepts.
-Cersei Lannister is in the castle and hears of the arrival of her daughter Myrcella but her joy is crushed when Jaime returns with her corpse. Jaime promises vengeance.
-Queen Margaery is still in the High Sparrow's custody in her cell, being pressured into a confession.
-Ellaria and the Sand Snakes kill Prince Doran, his highest lieutenants and Trystane (Doran's son).
-In Meereen, Tyrion Lannister and Varys are attending to the needs of the city.
-Daenerys' whereabouts are still unknown since she was surrounded by a army of Dothraki warriors. However, Jorah and Daario are searching for her and find a clue, a ring she left in the grass.
- Later you see Daenerys being whipped and prodded by two warriors who intend to bring her to Khal Moro. When she is delivered to him, she reveals who she is, a former Khaleesi of Khal Drogo. Khal Moro declares no harm will come to her but she will have to go to Vaes Dothrak, the Dothraki capital to live out the rest of her days with the widows or other dead khals.
In Braavos, Arya Stark is living life as a blind beggar as a lesson from the Faceless Man. Soon, the Waif appears to beat her up with a stick. Somewhat of a lesson on how to become a ruthless fighter by fighting without her eyes.
-In Castle Black, Jon's death is a hot topic and Davos will not allow anyone other than close friends of Jon's into the room where his body is being held. The door is kept locked as they negotiate with Ser Alliser Thorne and his crew.
-In the end, the red woman reveals her true self (a warped, wrinkled old woman) in a mirror after taking off her magical necklace.