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Before anyone starts reading this post, just know: It contains major spoilers. We're not going to reveal the actual twist for the sake of the series, but just know—it's safer to turn back now.

OK, that said: It seems that Game of Thrones star Lena Headey may have quietly dropped a huge GoT spoiler four weeks ago on Instagram, with a simple post featuring a set of rocks arranged as a heart. Here's the image, in case you missed it:

The caption? "My stone heart." 

Book readers probably get the reference instantly. Though Headey doesn't explicitly give an explanation for the pic, it may refer to the introduction of a huge character that appears in the book series that GoT is based off—A Song of Ice and Fire, that is. As for who that character is...let's put it this way: They are technically both a new character, and an old, beloved character at the same time. How's that for a riddle?

Of course, it's totally possible that Headey is trolling us all with the picture. Who even knows with this show?

Check out the pic above, and leave your thoughts in the comments below.

[via MTV]