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 away to raise the alarm. The criminals take advantage of the guards' absence by putting a fake pearl, the same size as the real one, in the shell. When the guards return with the director and the director sees the fake pearl, he thinks the guards were making it up, but then has second thoughts about the incident as a similar case happened at another museum two weeks before. Meanwhile, Tintin, Snowy and Captain Haddock arrive in Syldavia, a country in the Balkans. They have come to join their friend professor Cuthbert Calculus who has rented a villa near a