Eleven million copies of the book, which comes with a pixie elf doll, have been sold since it debuted in 2005.
According to tradition, the Elf's job is to keep an eye on the children in the house, and report back to Santa Claus each night about their behavior.
The Elf will move about the house at night, while the kids are asleep.
That's why the children will find their elf in a different spot each morning.
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