Punch, Pastries, and Poison

From USA Today bestselling author Harper Lin: the highly anticipated tenth book in the popular Cape Bay Cafe Mysteries
Fran throws Matt a birthday party at the cafe and invites all of Cape Bay to attend. Halfway into the party, many of the guests become sick, and some end up in the ER.
Fran fears the cause was food poisoning, but Detective Mike Stanton informs her that it was actual poison-someone at the party intentionally poisoned the pastries or punch.
Did the perp mean to target one person or to hurt as many people as possible? Did they want to shut down the cafe and destroy her business? Was it someone she knew or a sick stranger? Whoever it was, Fran had likely met the culprit at her party. And that makes her shudder.
When another partygoer ends up dead days later, Fran is on high alert. She must find the murderer before anyone else gets hurt.