Deadly Vintage by Elaine Flinn.
In this, Flynn's fourth Molly Doyle mystery, our heroine is settled happily in Carmel with her niece Emma. Haveing decided to branch out a little bit, Molly tries her hand at interior design. Hired by the Carla Jessop, the owner of a local winery to decorate its tasting room with antiques, she's astounded when Carla's husband vehemently disagrees with his wife's choice of designer.
A few days later, he is killed, in full view of a large group of people. Initially a suspect, Molly tries to distance herself from the investigation, but the Jessops keep asking her advice.
When a stranger appears claiming to be Emma's father, she becomes even more stressed.
It's fun to read about a place I've been, even though Molly's Carmel is not exactly the real one. And, as always in this series, there's some great information about antiques.