The Calculus Affair

The Calculus Affair is the eighteenth volume of The Adventures of Tintin. 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. HC 1st edition Catalogue Number 2/6056/4