At the end of the 19th century, three orphans - a seal, a dog and a cat - travelled across the countryside on their barge, La Verte Lande. They are discreetly trying to reach the sea to be free and safe from their pursuers: the terrible director of the Orphanage and his henchmen! But one morning, they discover a young lamb on their boat, looking for its mother and in desperate need of help...