There was once a time in the far north, as far north as land goes, when dinosaurs left footprints in the snow. What was life like for these dinosaurs living at the top of the world? Follow Pakky, a young pachyrhinosaurus, as she experiences her first sunless winter and learns about ice and snow. She discovers the wonders of the yearly cycle of life and migration, and that even though the time of light gives way to the time of dark, light always comes back again.