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Cassidy, Alexia, and Maya think that they will be coming home from boarding school to their loving parents, but they then find out that their parents have vanished. Shocked by the news and staying with their aunt, Elizebeth, they get a strange letter in the mail. This letter will unleash new mysteries and confusion for the girls as they follow the letter's instructions. All while they still fear who could go missing next, could it be one of them, or all three.