The busy summer tourist season is winding down in Busman's Harbor, Maine, but Julia Snowden senses trouble simmering for the Snowden Family Clambake Company. Shifty David Thwing--the "Mussel King" of upscale seafood restaurants--is sniffing around town for a new location. But serving iffy clams turns out to be the least of his troubles. . . When Thwing is found sleeping with the fishes beneath a local lobsterman's boat, the police quickly finger...