Haddock is dejected by Calculus' abduction, but upon learning that police have spotted the kidnapper's car at a port, he and Tintin race there, believing that the abductors seek to board a boat with Calculus and take him abroad. Tintin visits a hospital where the seven stricken members of the Sanders-Hardiman expedition are housed he is astonished that at a precise time of day, all awaken and scream about figures attacking them before slipping back into their comas. The police set up road blocks, but the kidnappers switch cars and are able to evade them. Tintin and Haddock realise that Calculus has gone missing, and surmise that he has been kidnapped by the same individual who placed Tarragon in a coma. The next day, Calculus is walking on the grounds of Tarragon's house when he discovers one of the mummy's bracelets, which he places on himself. They find Tarragon comatose in his bed, with the accompanying crystal shards nearby the attacker had bypassed the guards by climbing in via the chimney. Spending the stormy night at Tarragon's house, Tintin, Haddock, and Calculus are each awoken by a dream involving Capac's mummy. Worried, Tarragon states that this reflects the culmination of Capac's prophecy, which declares that punishment will descend upon those who desecrate his tomb. A lightning storm strikes the house and sends ball lightning down the chimney and onto the mummy-which evaporates. Professor Tarragon is under police guard, and he shows his visitors the mummified body of Inca king Rascar Capac, which the expedition brought back with them from Peru. Concerned, Tintin, Haddock, and their friend Professor Calculus visit Calculus's old friend Professor Hercules Tarragon, the only expedition member yet to be affected. The next day, they learn that the members of the Sanders-Hardiman expedition are falling into comas, with fragments of a shattered crystal ball found near each victim.

Meeting him backstage, Alcazar introduces them to his assistant, Chiquito. They also view the act of a knife thrower whom Tintin recognises as General Alcazar, former President of San Theodoros. There, they witness the performance of a clairvoyant, Madame Yamilah, who predicts the illness of one of the Sanders-Hardiman expedition members, who recently returned from an archaeological expedition to the Andes mountains. Young reporter Tintin, his dog Snowy, and his friend Captain Haddock spend an evening at the music hall.

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