Castle bookshop mysteries

"Shelby Cox never intended to become a bookseller, so when the former editor returns to her hometown of Alexandria Bay, nestled in upstate New York's breathtaking Thousand Islands region, to take over her aunt's bookstore, she has no idea what to expect. To her amazement, she discovers that she now owns a fifty-percent share in Bayside Books, and will also run the store's second location in the majestic castle on nearby Blye Island. But just as Shelby...

"Bookseller Shelby Cox has already sleuthed two murders from Bayside Books's home base on Blye Island, one of New York State's famed Thousand Islands. And this time, mayhem knocks right on Shelby's waterside door when she finds a body lodged between the side of her houseboat and the dock, his skull shattered"--