Naturalist and shark expert Steve Backshall celebrates the dazzling diversity of sharks, uncovering their secret lives and the threats they face. He begins by exploring the radical variety of sharks in the Atlantic Ocean and marks the start of a global journey in the so-called shark capital of the world, the Bahamas.

The naturalist learns about the sharks of the Indian Ocean, which despite finding ways to adapt to the environment, face threats from climate change, pollution and overfishing.