Cinnamon twisted / Ginger Bolton.

Enhanced descriptions from Syndetics:

Weeks before summer begins, Deputy Donut Cafe owner Emily Westhill has it all-a tabby cat by her side, cinnamon twists powdered to perfection, and a murderer on her case . . .

An ordinary late-spring afternoon for Deputy Donut Cafe owner Emily Westhill becomes one that will remain baked into her memory from the moment a customer gives Emily's cat a toy donut and then flees Deputy Donut, dropping an earring in her panic. Concerned about the customer, Emily attempts to return the earring . . . only this time the customer doesn't have a pulse. Things get more complicated when an ambitious police detective finds the earring and an unsealed envelope addressed to Emily at the murder scene. The envelope contains a cryptic letter and a fading photograph of a woman standing in front of Emily's house.

Why did the customer grab her cinnamon twists and flee Deputy Donut? With the detective eying Emily as a prime suspect, Emily is determined to find out. But once a donut-shaped murder weapon is discovered in her own backyard, Emily has no time to lose as she pulls apart the connection between the victim and the strange history of her property-while stopping the real culprit from ensuring her fate is done and sugar-dusted . . .