For kids 8 to 13, join the largest Arctic expedition ever undertaken--and discover the secrets hidden deep in the ice that reveal how one of the world's crucial ecosystems is changing. The Arctic is changing--fast. The once-frozen landscape is melting before our eyes, and the effects can be felt around the world. But the Arctic is also the region we know the least about. Thick ice, extreme cold, and total darkness have always prevented scientists from uncovering its secrets. Until now. This science-based guide for middle readers follows the 2019 MOSAiC expedition on the largest expedition to the Arctic ever undertaken. On board the Polarstern, a powerful ice-breaker research vessel, more than five hundred scientists from all over the world turned their attention to this mysterious region. Their mission? To let their vessel freeze in the sea ice and drift towards the North Pole in order to study how the Arctic is changing, and how these changes will affect our world.