Book of the Month special price First published in English in 1960 Interested by the possibilities offered by a long distance weapon of destruction, the ultra sound apparatus invented by Professor Calculus, the Bordurian government has Calculus kidnapped in Geneva. Soon Tintin and Captain Haddock are tracking him down. English Softback Current publications vary between Egmont and Farshore due to change of publisher. Picture is for illustration only.

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