Shy high school junior Riley Kowalski is spending her winter break on a research trip to Antarctica, sponsored by one of the world's biggest tech companies. She joins five student volunteers, a company-approved chaperone, and an impartial scientist to prove that environmental plastic pollution has reached all the way to Antarctica, but what they find is something much worse... something that looks human.
Riley has anxiety--ostracized by the kids at school because of panic attacks--so when she starts to feel like something's wrong with their expedition leader, Greta, she writes it off. But when Greta snaps and tries to kill Riley, she can't chalk it up to an overactive imagination anymore. Worse, after watching Greta disintegrate, only to find another student with the same affliction, she realizes they haven't been infected, they've been infiltrated--by something that can change its shape. And if the group isn't careful, that something could quickly replace any of them.外文書商品之書封，為出版社提供之樣本。實際出貨商品，以出版社所提供之現有版本為主。部份書籍，因出版社供應狀況特殊，匯率將依實際狀況做調整。
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