Tintin et le lac aux requins

Tintin and Captain Haddock are sent to guard Professor Calculus, who has invented a machine that can duplicate anything, and is staying in a village near the border of Syldavia and Borduria. However, an infamous and ruthless international criminal tries to lure Calculus and Tintin away by kidnapping two children, who live nearby, in order to get his clutches on the machine.