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.
- ISBN10 0316358479
- ISBN13 9780316358477
- Publish Date 30 September 1976
- Publish Status Active
- Publish Country US
- Publisher Little, Brown & Company
- Imprint Little, Brown Young Readers
- Format Paperback
- Pages 62
- Language English