Thirteen-year-old Lauren's life is confusing enough, with her mother remarrying, moving to another country, and introducing Lauren to a new stepfather and little stepbrother. But that's not nearly as confusing as the day two Nelfs (Santa's helpers) jump from his sleigh and into Lauren's life. With Santa's rounds finished for another year, Lauren is stuck with the bickering, meddling siblings until next Christmas. But when only Lauren can see them, her family start to think she's going mad.