SANTA IS MISSING! For most kids, Santa Claus is just a guy who comes down their chimney once a year. But he's much more than that to Nick and Marcia — he's their grandfather! So when Mrs. Claus calls to say that Santa has disappeared, Nick and Marcia head to the North Pole to start their search for Santa. Did Santa lose his directions? Did he have sleigh trouble? Are Donner and Blitzen playing a joke? Who knows?! But if Nick and Marcia don't find Santa in time for Christmas, there won't be presents for anyone — naughty or nice!