Rise of the Runelords
Your adventuring group tracked the giants, which attacked Sandpoint, to this location. A frontal attack was not possible but you were informed of a secrete entrance to catacombs below Jorgenfist.
Below is an image of Jorgenfist and the surrounding area. Around Forgenfist is a massive wall. Just outside the wall were many giant encampments. Remember, an army of giants was being assembled. Walking right up to the gates was not a good idea.
You were told there was a cave along the rive valley which cuts nears Jorganfist. It was here you could gain access to the catacombs below Jorganfist.