The Lion, the Witch and the Wardrobe by C.S Lewis

Four children get sent away during the Second World War to a massive, rambling old house. There they find their way into a magic, snow-bound land of Narnia. Here they meet two beavers who take them to Aslan’s How. Aslan is the fabled prince from over the sea. On the way, it becomes a race; one of the boys betrays the rest to the White Witch, who enslaved the land, making it always winter, but never Christmas. They know Aslan is on the move because Father Christmas visits them. They all meet at the stone table where Aslan sacrifices himself for the boy who betrayed them, so good wins out.