Title: Prisoners of the Sun.
Genre: Fiction, graphic novel, humour, adventure, mystery.
Publication Date: 1949.
Summary: A direct sequel to The Seven Crystal Balls. The story tells of Tintin and Snowy, with friend Captain Haddock, as they continue their efforts to rescue the kidnapped Professor Calculus by travelling through Andean villages, mountains, and rain forests, before finding a hidden Inca civilization with a secret of their own, and dire consequences in store for all those who discover it.
My rating: 8/10.
"I've nothing against you personally, but that pays a very old debt."