First published in English in 1972 Tintin's investigation into a mysterious chemical that when added to petrol increases its explosive qualities tenfold leads him to Khemed. Here he comes face to face with one of his arch enemies, Doctor Müller. The son of the Emir of Khemed, Abdullah, who has been kidnapped by Müller, gives Tintin an opportunity to be brave. English Hardback Current publications vary between Egmont and Farshore due to change of publisher. Picture is for illustration only.

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