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The Ekko Series · 书 2 之 7

The second book in the Ekko series. The polar night has come to Tromsø, and something new is lurking in the shadows. Sander and the artificial intelligence Ekko face a greater threat than before, and this time, not everything is what it seems. Bjørn V. Hauge continues the exciting, warm story of friendship between a boy and a machine, with more action, bigger puzzles and a Tromsø wrapped in winter darkness.

这本书是与人工智能（Claude）合作完成的。想法、故事和方向均出自作者本人；人工智能仅作为写作工具使用。如果存在有声书版本，则由合成人工智能语音朗读，而非真人配音。