Since the trio of characters are starting to take shape I figured it would be a good idea to gloss over the city where it all begins along with some very basic history as it concerns the separated twins and general knowledge of Barovia. We'll start off with the city, which we'll call Krotice.
Krotice is a large coastal settlement with a heavy amount of trade coming by land and sea into the city. It's a hard place to eke out a living, but Espie's adoptive family have established themselves over the years and provided her with a stable life style. While not the richest, they have a nice house, and while not the most influential of people, the family name is respected and they've been to known to mingle with the elite. The Morning Lord who is known as Lathander is the predominant god not only in Krotice, but throughout the region in general. A secondary temple exists to the Fates and Furies, a conglomeration of spirits that a handful of sailors, merchants, and gypsy's pay homage to. With all of the trade that comes through Krotice it's one of the easier places to acquire goods that typically aren't available elsewhere so long as you have the coin to afford it. Or slippery enough fingers to get away with it. Life on the streets is rough in Krotice and the poorer districts see a higher rate of crime due to the lack of steady patrols through those districts of Krotice.
Very little is known about the village of Barovia. Espie has probably heard the most about it, and even those tidbits don't amount to much. Rumor has it that along the main road that runs to the east and feeds into a few smaller fishing and hunting villages one can find an overgrown but still serviceable trail along the edges of the Svalich woods. It's marked by a stone gargoyle that once held a sign post, but that marker has long since rotted away. Follow that lost road and you'll come to Barovia, or so the gypsy's have been known to claim. Some merchants have sent small groups there in the past, but few have returned, and those that did spoke of packs of vicious wolves waylaying their caravans. So it's been years since anyone has made any known efforts to brave the road beyond the occasional bands of gypsy's that keep to themselves, mostly. Rumor is that the Barovian's are a lot like the gypsy's, quiet and proud, but talkative when drunk, and seemingly fine with toiling out their own existence in relative obscurity.
As for the twins and how they came to be in Krotice and be separated my thought was they delivered to an orphanage in Krotice while they were still infants. Who brought them there, and why remains a mystery as the orphanage fell to flames during the course of some infamous fire that swept through a few blocks back when the girls were still infants. Any records were lost, and Espie was fortunate enough to be adopted into her situation almost immediately after the fire. Touch's character wasn't so lucky, she was separated from her sister while they were still to young to really form any substantial memories of each other. She flitted about from orphanage to orphanage, and finally was just kicked to the curb when she was in her teenage years.
So that's some of my initial thoughts on some of those topics and I'm curious to see what everyone else thinks or may want to add or alter?