Death by chocolate frosted doughnut / Sarah Graves.

Enhanced descriptions from Syndetics:

Everything is shipshape at Jake and Ellie's new waterfront bakery The Chocolate Moose, especially now that the annual Pirate Festival is dropping anchor in their quaint island village of Eastport, Maine. Jake and Ellie are ready for the bounty of tourists sure to flood their shop. But their plans quickly sink when the body of celebrity-foodie Henry Hadlyme is discovered in the Moose's basement. Jake and Ellie are horrified, but their shock turns to dismay when Jake is pegged for the murder. Now, to clear Jake's name and save the shop, Jake and Ellie must swashbuckle down and figure out who among Henry's numerous enemies scuttled him in the cellar. Was it a long-ago jilted sweetheart's vengeful relative? His long-suffering personal assistant? Or perhaps some bitter-as-dark-chocolate unknown enemy, now aboard the mysterious ship lurking in Eastport's harbor? Alas, dead men tell no tales, so Jake and Ellie will have to get to the bottom of the case on their own and find the real killer before anyone else is forced to walk the plank...