Beluga whales share their northern kingdom in Greenland with a mysterious cousin: the narwhal. Both species begin a thrilling adventure through a maze of sea ice to their ancestral summering grounds in the Canadian Arctic. Even though they follow ancient migration routes, trouble lurks around every corner. From freezing environments to fierce predators, only their shared knowledge and power of family can get them through safely.

On an epic journey that spans the world's oceans in Dominica, the Azores and Sri Lanka, witness the complex culture of the gentle giants. Relying solely on the next generation's ability to learn their intricate ways, family culture and secrets, the sperm whales' future rests upon its youngest members.