Although it is known that screenwriter Anthony Horowitz has been working on drafting the Tintin sequel, it is still unconfirmed exactly which published adventure (or adventures) will be adapted for the big screen.
“I’ve got several favorite stories,” Jackson told ComingSoon.net back in 2009. “I like ‘Seven Crystal Balls’ and ‘Prisoners of the Sun.’ I like ‘The Black Island.’ I like ‘The Calculus Affair’…the moon one[s] would be great to do as a third or fourth one.”
Early rumors suggested that the two-part “Seven Crystal Balls” and “Prisoners of the Sun” would be the focus of the sequel. That was prior to the release of the first film, which ended up only adapting a single scene from the graphic sequel to “Secret of the Unicorn,” “Red Rackham’s Treasure,” leaving much of that storyline available to bring to the screen. That particular book introduces Professor Cuthbert Calculus, a character that Spielberg himself told ComingSoon.net was likely to make an appearance in future films.
Jackson goes on to say that post-production on another Tintin will take two years so 2015 is likely the earliest we’ll see the return of Tintin and Captain Haddock.