I'm exploring the Storm Coast, trying to clear everything I can in the zone, and there's several markers for Varric's personal quest on the map:
As you can see in that screenshot, there's a cave marker near them. When I go there, though, all I find is this, which appears to be a door:
There's no option to activate it, and searching up and down the area, I can't see a way around it. So, just how am I supposed to get up into that area to my North-West?