The Taking of Annie Thorne by C.J. Tudor
One night, Annie went missing. Disappeared from her own bed. There were searches, appeals. Everyone thought the worst. And then, miraculously, after forty-eight hours, she came back. But she couldn't, or wouldn't, say what had happened to her.
Something happened to my sister. I can't explain what. I just know that when she came back, she wasn't the same. She wasn't my Annie.
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