While on holiday at the North Sea, Anna finds a helpless baby seal on the beach. For the animal reporter, a fight for the life of the wild Hilde and a race against time begins: in three months the seal has to be fit enough to return to the North Sea. While wild Hilde is cared for in the seal sanctuary, Anna explores the Wadden Sea, Hilde's habitat, on land, from the air, on water and under water.