From the first night, Fliss has terrifying nightmares about a mysterious, locked room on the first floor—. She dreams of a pale, gaunt figure with red eyes and long, sharp fingernails emerging from the room. She soon discovers that, according to the guesthouse layout, there is no Room 13 (rooms jump from 12 to 14). Yet every night at midnight, the room appears, and the sinister occupant—a modern-day vampire—emerges to prey on one of the students.

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Teachers frequently select the novel for several reasons: