So you have read the first book. Ah yes, I'd forgotten that was the first volume. They blur together a bit, given how often my family reads them. Those books dark as they sometimes were were practically bedtime stories for my brothers as children, and I they were usually kind enough to let me listen with them.
And they were important stories to know, since historical details like whose idea it was to create the railway pass between the Creve Mountains was a matter of much debate at our table during the Feast of Light. My great uncle gives the credit to our family, as the book describes, but there's a faction of the family that insists that it was a stroke of genius on the part of my great-great grandfather's friend Christophe Blanchette. Blanchette himself was a was a transportation expert, but his father had been a miner and (of all things!) something a demolitions expert, so he had some family knowledge of which mountains could be easily carved for track. Needless to say, my uncle doesn't mention him in the book.
Oh dear. Perhaps that was too much to say. But I suppose I've written it, and it's not untrue.
At any rate, I'm impressed with your you clearly have a good memory for details, I must say. Though I suppose that's practically required of a detective. How did you end up here, of all places?