Vol 6: Land of Black Gold: Tintin goes undercover to the Middle East to solve a mysterious oil crisis, and he inadvertently gets caught up in a coup attempt. Destination Moon: After receiving a telegram from Professor Calculus, Tintin and Captain Haddock travel to meet him at the atomic centre in Syldavia. They soon discover that Syldavia's secret rocket ship documents have been stolen. Explorers on the Moon: Tintin, Captain Haddock, Professor Calculus and Wolff blast off to the moon and discover that the Thompson twins have slipped on board.