As HBO gets deeper into production of the seventh season of its hit series "Game of Thrones," fan theories abound online based on leaked production photos from the set.

While fans of the series have always been interested about insider information, it is noticeable that they are even more interested now because "A Dream of Spring" — the final book in the "A Song of Ice and Fire" saga in which the season should be based on — has not yet been released by author George R.R. Martin.

In fact, the last season has already overtaken the events of the book series as Martin has failed to release "The Winds of Winter" — the sixth book in the series — prior to the airing of the show's sixth season.

Among the rumored events to take place in season 7 involves Arya Stark (Maisie Williams), who has been separated from her family since the end of the first season.

According to Watchers on the Wall, Arya Stark — who has learned skills to become an assassin from the Faceless Men of Braavos — will kill Petyr Baelish aka Littlefinger (Aidan Gillen), who tried to pit the Starks against each other and has blackmailed her older sister Sansa (Sophie Turner).

After the season 6 finale showed Arya killing off Walder Frey (David Bradley) by serving up his own son to him and slitting his throat, the report further said that Arya will use his face to summon all the Freys to poison them all, effectively avenging her mother and brother who both died in the tragic and violent Red Wedding, the Daily Beast reported.

Meanwhile, another leak hints that three of the contenders for the Iron Throne — namely Cersei Lannister (Lena Headey), Jon Snow (Kit Harington), and Daenerys Targaryen (Emilia Clarke) — will be forced into making an uneasy alliance in order to fight off the White Walkers.

However, Cersei will allegedly betray the alliance, which will cost her the loyalty of her brother Jamie (Nikolaj Coster-Waldau). who will then ride North to fight the advancing threat against the Wall.