Concluding the story begun in The Secret of the Unicorn, Red Rackham's Treasure follows Tintin and friends as they search for the pirate booty procured by Captain Haddock's ancestor, Sir Francis Haddock, in the West Indies. They receive some unexpected help in the form of a hard-of-hearing inventor named Professor Calculus, who would go on to become one of the most endearing characters of the series.
