When rumors spread about the 'Hemingway Papers' unveiling a hidden treasure's location on a remote Mediterranean island, Lupin seizes the opportunity to investigate. However, his quest for riches quickly transforms into a dangerous power struggle on the island. To Lupin's astonishment, his comrades Jigen and Goemon have their own motives entwined in the conflict. Moreover, the arrival of Marcus, known as the Merchant of Death, alongside Fujiko, Lupin's Achilles' heel, and the relentless police inspector intensifies the already volatile situation.