In The Seven Crystal Balls (1948), Seven scientists mysteriously fall into a profound state of lethargy. As Calculus has disappeared,Tintin and Captain Haddock set off in search of the Professor. Created in 1929 by Georges Remi - who was already signing his drawings under the pseudonym of Hergé - Tintin will be subjected to twenty three adventures whose success - among those between 7 and 77 - has yet to wither.