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 Julia's brother-in-law, Sonny, as the one who cooked up the crime. Sure, everyone knows Sonny despised the Mussel King...but Julia believes he's innocent. Proving it won't be easy, though. It seems there's a lot more than murder on the menu, and Julia needs to act fast....