First published in the United States in 2023. First published in French as La boîte à musique 4 : La mystérieuse disparition in 2020 by Dupuis.
Summary:
Since speaking to Siloé, Nola has learned a lot about her own mother and the history of Pandorient, but there are still questions and when Nola finds a strange key she returns to the other world to find out what the key will open--but nobody knows what might happen if this particular door is unlocked.
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