This year, Moomin's hibernation is not as deep as usual. One day, he wakes up. With wide eyes, he discovers the white winter world. Because it looks so enchanting outside, he decides to wake up Snorkmaiden. During a walk around the Moomin house, they both discover that most of the firewood has disappeared. They find it again at the edge of a large cliff. Someone has piled the logs into a huge mountain. Tudicki, who fishes under the ice every winter, knows what it's all about. The invisible winter creatures have prepared their solstice fire to celebrate the day when the sun finally shines above the horizon again. But there is someone else who is interested in the piled logs: the Mora.