This is the Book One Counterpart of this shop, are you looking for Alina's Potion Shop (Book 3)?
Alina potion shop is a shop located in Falconreach, but doesn't plays yet a role in any saga, although you can train Mana alchemy here.
Alchemy is trained at Reens' Potion shop and Alina's Potion Shop. For Alchemy working, you need to gather reagents in Alinas' quests, after this you must "train alchemy", that actually is a combination game.
Threre are also some undead alchemists, that died trying to get the Magic Stone