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This story opens on a terrifying note. Kay and Eloise's father is working late at his college, as usual, but when the two girls and their mother arrive to pick him up, they are told he does not work there. In fact, everyone they meet insists they have never heard of him. It sounds like the beginning of a scary murder-mystery, or a cat-and-mouse chase in the style of James Bond or Dan Brown, but what actually lies behind this event is far stranger and more confusing. Later that night Kay hears voices at her window and embarks on a quest to rescue both her father and her younger sister from ruthless beings who are decidedly not human.