The next morning, he visited Professor Calculus. The half-deaf genius was calibrating a new ultrasonic depth-finder. “Calculus, does ‘UN-7’ mean anything in naval history?”
“Perhaps,” Tintin said, but his eyes were sharp. He pulled out a notebook. The same number—UN-7—was etched inside the cannon’s barrel. And again, on the underside of the stern gallery. Three times. Deliberate. The Adventures Of Tintin Secret Of The Unicorn Serial Number
Captain Haddock opened it with trembling hands. It was Sir Francis’s final testament—not a treasure map, but a confession. The Unicorn had been carrying not plunder, but a treaty that would have ended a secret war between two kingdoms. The ship was sunk not by pirates, but by a traitor in the Royal Navy. The three parchments were a decoy to mislead the traitor’s descendants. The next morning, he visited Professor Calculus
Tintin smiled, closing the folio. “Sometimes, Captain, that’s the only treasure worth finding.” He pulled out a notebook
Behind it, a fissure in the cliff.