Risen Castle in the North West

Up in the top left corner of the map, I thought it looked a little like a house on the map....so I went there to rest after clearing the castle further down South along the coast ( by the way, ouch, skeletons can hit hard sometimes ). Anyway, near the North West castle (house, heh), there's an iron grate/portcullis type thing in the cliff face, with a cave beyond. Anyone know how to get in there?

It's quest-related, can't get in until you reach a certain point in Patty's questline.

Keep playing the game. The main plot will eventually get you behind that gate.

Thanks for the replies, always like to be sure I'm not missing something obvious.