After robbing a Moscow casino right under Zenigatas nose, Lupin sets his sights on stealing the Trick Diamond. He and Jigen head to the estate of the recently deceased Mark Williams, another master thief whos had the diamond, as well as other treasures, in his possession for years. However, instead of finding the diamond, Lupin & Jigen find Fujiko, who tells them about Marks dying wish - Lupin must return all the treasures the old thief stole to their rightful place. If this is done in time, the location of the diamond will be revealed, and Lupin can use it to get the real treasure, hidden in Gaudís Sagrada Familia. Returning the stolen goods isnt easy though, as Zenigata and the casino boss ruthless gang are on Lupin and friends tail.