In an attempt to save Professor Tarragon (the last remaining member of the expedition not affected by the illness), Tintin, Haddock and Professor Calculus stay the night at Tarragon’s villa. During the night, the occupants of the house are plagued by nightmares; when Tintin and his friends wake up, they discover Professor Tarragon in a coma with fragments of crystal beside his bed.
The next day, Professor Calculus makes an incredible discovery that takes our heroes on a whole new adventure!
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