In the "Secret of the Unicorn" and "Red Rackham's Treasure", Tintin joins Haddock on the trail of Sir Francis Haddock, the Captain's glorious ancestor. With his shark-shaped mini-submarine, the new comer and inventor Cuthbert Calculus will help in the discovery of the treasure and will ultimately contribute to allow Captain Haddock to acquire his family's estate: Marlinspike Hall. Three models of the 'Unicorn' will make it possible to discover Red Rackham's treasure, the legacy of a pirate Captain Haddock's ancestor had fought against. This is an adventure full of surprises and which will end in Marlinspike Hall where Nestor, the famous butler, will perform a well noted entrance. Each story is approximately 30 minutes long.