The penguins of Antarctica write a letter inviting the polar bears of the Arctic to join them at the South Pole to celebrate their longest day of the year. But how will the polar bears get there? It's such a long journey—will they make it in time? What will they bring? And what will happen when they arrive? combines a playful story of friendship with humorous imagery depicting the differences between Earth's polar regions. With fun facts about penguin and polar bear species, the distance between the poles, and the summer solstice, this will be the most exciting party thrown by penguins you've ever attended.