Jessica, the daughter of an impoverished apple farmer, still believes in Santa Claus. So when she comes across a reindeer with an injured leg, it makes perfect sense to her to assume that it is Prancer, who had fallen from a Christmas display in town. She hides the reindeer in her barn and feeds it cookies, until she can return it to Santa. Her father finds the reindeer and decides to sell it to the butcher, not for venison chops, but as an advertising display.

Harriet may only be in the sixth grade, but she's already found her calling: to be a spy. In a private journal she takes everywhere, Harriet records suspicious activity and keeps a running list of observations on virtually everyone she knows. It seems harmless enough until, one day, someone finds the journal and exposes Harriet's critical thoughts about her classmates. Suddenly, even her best friends are against her, and Harriet resolves to take revenge.