The Walled Flower - Lorraine Bartlett

If Katie Bonner's late husband hadn't invested all their savings in
the crafts fair Artisans Alley, the Webster mansion could have been
hers to remodel into a bed-and-breakfast. Instead that dream
belongs to another young couple. But that dream becomes a nightmare
when a skeleton is discovered sealed in the walls of the mansion. The
bones belong to Helen Winston, who went missing twenty-two years ago.
Heather's aunt, a jewelry vendor at Artisans Alley, asks Kate for help
finding her niece's murderer. The case may be cold, but the killer is
very much alive-and ready to go to any lengths to keep past secrets
buried...