Publisher: Little | ISBN: 0316358479 | Edition 1976 | PDF | 65 pages | 26,3 MB
The classic graphic novel. Tintin and Captain Haddock peek in Professor Calculus' laboratory to find a sonic device and a very mysterious-and violent!-stranger. Realizing that Calculus' life is in danger, Tintin and the Captain rush to warn him before it's too late.