3.5 stars.

It was nice to go back to Scandrial as it was at the beginning of the mistrborn trilogy, with ash falling down from the sky and strange-behaving fog. It made me recall the good memories I had when I was reading the mistborn trilogy six years ago. I loved Kelsier back then as much as Ioved him in this novella. Now I don't recall if his story with Mare and the Pits was explained in the first book [I just looked up in the summary provided by Coppermind and found very little information given. However, on the page dedicated to Mare, the references lead to the first book]. Anyways, I would have loved to have more information about what happened in the Pits and why. On the other hand, I understand that the scope for which this novella was written did not allow in-depth information.
My rating is kind of low, because plotwise there's little happening (understandable since the low number of pages), but you know, with Kelsier there's always another secret and I wanted to have more of pre-Mistborn Kelsier. :D