This documentary describes the life and behavior of a family of killer whales (orcas) living near the Crozet Islands. The killer whales' success is attributed to their tight-knit family structure and collaborative hunting strategies. The whales, led by a matriarch named Lisor, pass down crucial skills to their young, with a special focus on Delphine, a young female. It highlights instances where Delphine gets into trouble, such as being beached or lost in seaweed. The family rallies to rescue her in these situations, showcasing their strong bonds. The whales hunt seals and penguins, demonstrating their coordinated efforts and hunting techniques. The documentary also emphasizes the importance of family unity, teaching, and survival strategies among killer whales in their natural environment.