From the author of The Underworld: Journeys to the Depths of the Ocean, and based on her bestselling adult work Voices in the Ocean: A Journey into the Wild and Haunting World of Dolphins comes a thrilling journey for young readers into the spiritual, scientific and sometimes threatened world of dolphins, in an accessible format that engages as well as entertains. Inspired by an encounter with a pod of spinner dolphins off the coast of Maui, author Susan Casey embarked on a two-year global adventure to study these remarkable beings. Casey details the extraordinary connection between dolphins and humans, including shared characteristics such as capacity for emotion, playfulness, sociability, and intelligence, the sophisticated navigation ability innate in dolphins, and the dangers they face from people who aim to profit by putting them in captivity or far worse. Includes an 8-page photo insert that offers a glimpse of these magical creatures in their natural habitat.