This charming tale by Catherine Veitch tells the story of Nat, a young narwhal who is full of curiosity. Nat doesn't know what his tusk is for, so he sets off through channels in the Arctic ice with his friend, Belora the beluga whale, to find out - and who better to ask about tusks than a walrus? Delightfully illustrated by Ela Smietanka, this simple tale introduces children to a range of ocean animals.