As filming gets properly underway for Game of Thrones series 7, more and more details are leaking out about what we can expect to see happen in next year’s gory adventures, from returning characters to new locations.

Now, however, fan site Watchers on the Wall (who are usually a pretty reliable source for behind-the-scenes gossip) have uncovered a major storyline for the 2017 run, which could have grave repercussions for some of the series’ main characters. 

Of course, said details could contain some spoilers for series 7, so look away now if you want to enter the series pure as a newborn White Walker.

Still here? OK, good – apparently recent filming has focused on Ironborn warriors Yaya and Theon Greyjoy (Gemma Whelan and Alfie Allen) in a fierce battle at sea, which will result in their uncle Euron (Pilou Asbæk) capturing one of them for nefarious purposes.

Now, we’re betting this abductee will probably be Theon, as contrasting this imprisonment with his torture at the hands of Ramsay Bolton could be interesting, while doing damage to Yara wouldn’t help the show’s reputation for being violent towards its female characters. And we wouldn’t be surprised if this storyline has its origins in The Winds of Winter, George RR Martin’s as-yet unpublished sixth novel in source series A Song of Ice and Fire which recently released a preview chapter focused around a different Greyjoy imprisoned by Euron.

Pilou Asbæk as Euron Greyjoy in the series

However, we’re even more interested in the other plans WOTW have uncovered for Euron, which involve him scrapping his plan to team up with invading queen Daenerys Targaryen (Emilia Clarke) in favour of a new alliance – one with self-crowned Westeros monarch Cersei Lannister (Lena Headey).

This dangerous duo will apparently take out at least one of the Sand Snake warriors from Daenerys’ ally nation Dorne (which some critics of the characters might well enjoy), and overall it sounds like they could be a suitably dire threat for Daenerys and Jon Snow (Kit Harington) to deal with as they negotiate their own kingdoms in the ensuing series. Don’t you love it when an evil plan comes together?

Game of Thrones will return in summer 2017