Tintin and the Lake of Sharks (1972)

Tintin is tasked with safeguarding Professor Calculus, who has developed a groundbreaking duplicating machine, while residing in a border village between Syldavia and Borduria. However, their peace is shattered when the notorious criminal Rastapopoulos schemes to seize the invention. To draw Tintin and Calculus into his trap, he kidnaps two local children. As danger looms, Tintin must navigate treachery and rescue the young captives while protecting the professor's revolutionary creation from falling into the wrong hands. Action and intrigue unfold in this thrilling adventure.