A boy is herding his family's reindeer when they are drawn into a mysterious cave. The cave is the holder of eternal summer, looked after by three strange characters. Once entered, the cave cannot be left without time in the outside world standing still. After the first year, the boy is allowed to see his family in the outside world. Time stands still as he visits his parents, and he leaves gifts behind to show that he has visited ... and Christmas traditions as we know them, starts to be created