Not telling a soul about the secret, special gift she wants Santa to bring, Kari's brothers warn her that she may end up with a box of underwear under the tree, but Kari has faith that Santa will get her note and so waits eagerly on Christmas morn for her package to arrive. Simultaneous.
Kari insists that as long as Santa knows what she wants for Christmas, she doesn't need to tell anyone else. This puts her family in aquandary, but no amount of family sharing or threats cause Kari to divulge her Santa secret. And it remains a secret until Christmas morning when her secret is fulfilled.
I like to go through the Scholastic Book Orders and check some out from the library before purchasing. This one was quite stupid. The basic story is okay, but it's hard to tell whether the main character is the girl or the dog.