The story begins with Tintin and Captain Haddock back to Marlinspike, when surprised by a storm, a strange storm causes breakage of mirrors and vases around the palace. The strange storm turns out to be the evidence of an ultrasonic generator developed by Professor Calculus, which will disappear after a few days at a conference in Switzerland.
Tintin and Haddock meet in Geneva to continue its door, and just when they are about to release him from his captors, Borduria, Calculus is kidnapped again, this time by the Syldavian. However Syldavia spies are not able to retain Calculus which is again kidnapped by Borduria and transferred to Szohôd. Finally with the help of Bianca Castafiore get rescue Litmus, who decides to destroy the plans of his invention to prevent it becoming a weapon.
In this story again reflected the tension and rivalry between Syldavia and Borduria, reflecting the situation that existed between communist and capitalist blocs at the time.
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