After negotiating with the blue dragon Vermafex, she gave you the corpse of Gregore Stonehew, dwarven (ex)-explorer. On said corpse, in addition to some magical items which have been divied up, there was a map of the ruins of Treffenholm, and a diary.
Here are some of the more pertinent entries from that diary.
Kurn ascendent, day 13, 1036 AC
It is an auspicious day, but not one I expected. While taking a break from my months of unsuccessful studies at the grand library of Bareira, I met in a cafe a most curious man, who regailed me with tales regarding Kirwin's journeys during the Godwar. It took me a while to believe this eccentric elf, but as I listened, more and more of what he said matched what my studies had told me. To make a long story short, while not knowing the ulimate fate of Kirwin Swordsinger, he had deducted where Kirwin's treasure was - the fabled Grotius Cube. As I had suspected, it lies in the ruins of Treffenholm, and had not entered the Settled Lands as had previously been posited.
Paksee waning, day 2, 1037 AC
It took me much longer to get here to Steirholm than I expected - my uncle most unreasonably refused to extend to me the funds needed to complete the journey. However, having borrowed heavily from his till, I now finally have the money I need. I know he will be angry when he finds out - and thus I leave at dawn - but his tune will change when I return iwith riches and glory - and the Cube!
Ellaselle ascendent, day 20, 1037 AC
I have installed myself at the court in Steirhold and have begun to (carefully) search for more information regarding the ruins of the old hold
Fenor aspiring, day 17, 1037 AC
What great luck - the fool Cervenish has let slip the very information I need to continue my quest - that old plans for Treffenholm can be found located in the vaults of the Steirholm library. Now, just to figure out how I can get my hands on them to make myself a copy...
Fenor aspiring, day 30, 1037 AC
Sweet fortune shines on me! In now have the maps in these very hands! The real maps, alas, which will mean I have to act quickly to avoid discovery - there was no time for me to be able to copy them. Also alas, I had to abuse Lady Elamir's trust horribly, which is a shame for this will surely mean that our most palitable relationship must end. Nut no matter - once I have the Cube, riches and women will be mine as easily as plucking a peach from a tree. Still, I will miss those sweet lips.
Fenor ascendent, day 6, 1037 AC
I'm finding the maps less helpful than I had hoped - at least this close to the Scar, everythings a terrible jumble. Hopefully, as I manage to penetrate this shamble of stone I will be able to place myself on my charts.
Fenor ascendent, day 23, 1037 AC
At last! I have finally found my way past the wreckage and into the ruins themselves! Alas, not where I had hoped, but hopefully enough remains intact that I might still make my way.
Paksee aspiring, day 2, 1038 AC
I had hoped that the passing of the old year would see me with my prize in hand, but no such luck, as I find my path blocked by a section of flooded passages and corridors. I have started to look for a way around, but no luck so far.
Paksee aspiring, day 12, 1038 AC
I'm beginning to think there is no way around, which means I will have to risk a trip back to Steirholm to acquire some potions - a couple waterwalking and perhaps a waterbreathing incase the passage will become completely flooded. As always, the thoughts of the prize to be had carries me through my setbacks. I am so close I can feel it...
Paksee waning, day 3, 1038 AC
I must have offended Her Lady Paksee somehow, for somehow, in this her season, she has turned her eyes away from me and let the Lord Fenor rule my house. Alas, the Young Lady is fickle, but it seems I have regained her affection. 2 months ago, after procuring the potions, I was caught and arrested on suspicion of stealing those old maps. Fortunately, I had the foresight of hiding them before entering the hold, otherwise I would be having trouble writing, what with my soul and body having been made strangers. Instead, I am now free - it seems that Lady Paksee is not the only lady in whom's heart there is still affection. Now, however, I must reclaim the maps and reclaim my prize, so that I might her sweet lips once more.
Paksee waning, day 5, 1038
Alas, it seems I have regained the affection of the one Lady more than the other, for Paksee once again shuns me. In recovering the maps, I was spotted. Due to my quick wits, I made my way free, but unfortunately the known paths into the ruins are now guarded. It seems I will have to find another path. MY greatest regret is that my camp is still set up in the ruins, and I will have to do without it until I can make my way to the Cube and back to it. A pity - until I make it back to it, there will be no luxury in my life.
Pakesee waning, day 10, 1038
She smiles again - I believe I've found a way in! I've found a shaft down into the mountain, and after a short climb will let me know if this is one more disappointment, or if my prize is again within reach.
And that is the final entry.