Sebastian Heart is living with the Grinch and the Invisible Man. His mother is in the Antarctic and he's pretty sure no one has bothered to buy him a Christmas present. There is a storm of storms on Christmas Eve. A runaway semi shoved the family SUV off the road and down the embankment. Sebastian has to step up to save his brother and dad. He wasn't, however, anticipating having to ride the back of an enraged grizzly.