How does Santa really know if you have been naughty or nice? After much urging by the elves and Mrs. Claus, Santa has allowed his biggest secret to be revealed in this book, The Elf on the Shelf: A Christmas Tradition. Santa has partnered each book with a scout elf which children name. They can then visit the north pole (elfontheshelf.com) to register the elf’s name in the Hall of Registry and print their official elf adoption certificate. All Santa approved of course!