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Mrs. Boullock asks Tintin and the Thompsons to find her missing millionaire husband, but two amnesiac men both claim to be him. Tintin seeks help from Professor Doryford and his truth-detector while an impostor’s henchmen try to stop them; the adventure ranges from Brussels to Casablanca, Argentina, China and Tibet before the impostor is exposed.
At a celebration in the Maharaja’s palace, Tintin discovers that a celebrated blue diamond has been stolen and concludes that the thief is among the guests. He and detectives Durant and Durand question them aboard a ship to Syldavia, where Tintin uses a telegram to catch the culprit in the castle’s medieval hall.
Mrs. Boullock asks Tintin and the Thompsons to find her missing millionaire husband, but two amnesiac men both claim to be him. Tintin seeks help from Professor Doryford and his truth-detector while an impostor’s henchmen try to stop them; the adventure ranges from Brussels to Casablanca, Argentina, China and Tibet before the impostor is exposed.
At a celebration in the Maharaja’s palace, Tintin discovers that a celebrated blue diamond has been stolen and concludes that the thief is among the guests. He and detectives Durant and Durand question them aboard a ship to Syldavia, where Tintin uses a telegram to catch the culprit in the castle’s medieval hall.