Off Cape Cod, a tuna buyer is found dead, a harpoon in his chest. The man’s grandfather asks part-time P.I. Aristotle “Soc” Socarides to investigate and Soc needs the money. Soc can’t shake an uneasy feeling, but he is curious. The case soon explodes into an excavation of the bluefin-fishing community. As Soc learns, it is a cutthroat group, where a single tuna’s price tag may inspire evil.