After buying a model of the Unicorn, young reporter Tintin discovers a secret message hidden inside the mast of the ship. The clues start to pile up as Tintin and his faithful dog, Snowy, find themselves sailing, flying, and riding camels around the globe on an epic adventure. Hot on the trail of the story, Tintin meets the hearty seadog Captain Haddock. The captain's ancestor Sir Francis Haddock sailed the Unicorn and fought against the pirate Red Rackham. Did Sir Francis leave behind the clues? Is the secret of the Unicorn the location of Haddock's treasure? Can Tintin, Snowy, and Captain Haddock solve the mystery before the secret lands in the wrong hands?