Tudy, a young lifeboat who belongs to a great family of rescuers, dreams of heroic rescues on the high seas. Alas her father, the Admiral, fears to lose his daughter as he lost his wife and he forbids her to leave the harbor. However, an encounter with her idol Begbraz, a lifeboat whose exploits she admires deeply, will change everything. When he asks for assistance, Tudy doesn’t hesitate to set sail and join him at sea which will be the beginning of a long journey. With the help of Ahab the crab and Adèle the seagull, she will thwart a fishing poaching network and prove to her father that she is ready to perpetuate the glorious lineage of rescuers of the Island of Avel.