In 1943 we meet the character Professor Calculus and the faithful Marlinspike Hall butler Nestor when Tintin, Snowy and Captain Haddock set off to find the long-lost treasure of Red Rackham the pirate. The clue to the treasure's hiding-place was discovered in The Secret of the Unicorn. Enjoy a voyage to the South Seas, strange finds on a desert island, and most unusual underwater adventures.