Overfishing has already collapsed the Newfoundland cod stocks that once seemed inexhaustible, and journalist Charles Clover, adapting his own book, sets out to show it happening again to the fish still on restaurant menus. He follows the trail of bluefin tuna into Tokyo's Tsukiji market, where prices per fish run into the thousands of dollars even as populations crash, and travels to Senegal, where industrial trawlers competing with local fishermen have emptied waters that once fed entire coastal communities. Scientists including Daniel Pauly and Boris Worm lay out the numbers behind the film's central claim: that the seafood species people currently eat could be commercially finished by 2050. The camera moves between open-ocean fishing fleets, fish auctions, and supermarket seafood counters, tracing how a piece of fish on a plate connects back to a depleted stock thousands of miles away. Clover also presses restaurant chains and retailers on why endangered species stay on their menus, turning the investigation from a nature story into a question about supply chains and consumer choice.