Nat is a curious young narwhal who is annoyed by his ever-growing tusk. He wonders why he has a tusk at all. In pursuit of an answer, Nat sets off on an adventure with his friend Belora, a beluga whale. The two friends travel through channels in arctic ice to find someone who should know something about tusks--a walrus. This imaginative story of adventure and identity will allow readers to learn how to ask questions, look for answers, and stay curious.