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Sarah’s been having strange dreams… a tiny
jellyfish, a giant tree, a mysterious forest. But what
if it’s all true? With her younger sisters Cassiopeia
and Lucille at her side, Sarah, alias Rolling Thunder,
will lead the investigation to decipher her mysterious
visions. In the process, the Grémillet sisters will
stumble on their mother’s hidden past and uncover a long-buried family secret!