by Paolo Colombo, Anna Simioni · Piemme · tapa blanda · ISBN 9788856674965
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Gemma and Riccardo are great friends with the old professor who lives on the top floor of their building. When he suddenly disappears along with all his computers, the two children immediately realize that something is wrong. To track him down, they have only one clue: strange audio recordings that emit sounds that seem to come from very, very far away. Recommended for readers aged 9 and up.
