The Silver Needle Murder by Laura Childs.
I hadn't realized that Childs was up to her ninth Tea Shop Mystery, but apparently she is. It even says so on the title page (which I would provide a link to if I could find one, but I can't).
It's the first Charleston Film Festival, and the Indigo Tea Shop is busy hosting their special events. But at the opening event, a famous director is killed. When one of the judges quits as a result, Theodosia is "asked" to fill in, and investigate the murder at the same time.
She doesn't know how she will investigate, judge a film competition, attend red-carpet events, and run her tea shop, all at the same time, but vows to try. Being so busy, and with a lot of roadblocks and red herrings thrown in her way she stumbles on the killer's identity by quite by accident.
The story starts a little slowly, but becomes more engrossing as it progresses.
Childs also writes the Scrapbooking Mysteries, and has a new series set in a small-town cafe called the Cackleberry Club to be released in December.