Collecting Dust

From the introduction:

The scenario opens with one of the investigators incidentally coming into possession, in one way or another, of a singular antique; a handcrafted porcelain doll that they find is quite valuable; one of the few surviving creations of local Arkham craftswoman Hilda Francks. The dolls of Hilda Francks have become collector items around the country. There are believed to be around one hundred of Hilda’s hand made dolls in existence, an unknown number remain intact, mostly in the Miskatonic River valley. Each a work of art, the dolls of Arkham’s resident master doll maker have fetched thousands of dollars on the open market. Not much knowledge remains of the artist herself, however.