The Adventures of Tintin: The Secret of the Unicorn (video game) wants to get the third scroll, and that he is in fact Allan's boss. After a fight with Allan, Tintin gets the third scroll and heads off to Brittany, where he and Haddock earlier identified as Sir Francis' hideout. Learning that the scrolls contain the coordinates of the treasure of Red Rackham, Tintin and Haddock plan to head there, but Haddock is kidnapped by Allan, who uses him as a hostage to get the scrolls. After rescuing Haddock, Tintin discovers that the treasure is hidden within Marlinspike Hall. There they find the treasure and Thomson and Thompson arrest Allan and
Tintin and the Lake of Sharks risks of a diplomatic incident. Two days pass before Tintin finally returns to Calculus' house with the shark-like submarine which Calculus built during the search for "Red Rackham's Treasure". The plan is that Tintin will meet the crooks on the beach, and Haddock will follow him in the sub. At the meeting point, criminals pick Tintin up in a submarine, and they head underwater to the flooded city where their base is situated. The mastermind behind this operation is revealed to be none other than Tintin's nemesis Rastapopoulos, now calling himself "King Shark"/"Mr. Big". Rastapopoulos promises to set Niko and