When unscrupulous Bordurians kidnap Professor Calculus and imprison him in the remote fortress of Bakhine, Tintín, Milú, and Captain Haddock set out to rescue the professor and his latest fantastic invention. The intrepid reporter Tintín, accompanied by his loyal fox terrier Milú and the gruff Captain Haddock, must navigate the treacherous political landscape of Borduria to locate the kidnapped Professor Calculus. Their mission is complicated by the formidable defenses of Bakhine fortress and the cunning of the Bordurian regime, all while trying to secure the professor's groundbreaking invention.

The Tintin series is widely celebrated for its intricate plotting, detailed artwork, and blend of adventure and humor. This particular volume, 'The Calculus Affair,' is often cited as a prime example of Hergé's mastery in storytelling and visual design. Readers appreciate the engaging narrative that balances suspense with moments of lightheartedness, making it a favorite among both long-time fans and new audiences. The series as a whole is recognized for its enduring appeal across generations and its significant contribution to the graphic novel medium.