As her beloved grandfather, chief of the Maori tribe of Whangara, New Zealand, struggles to lead in difficult times and to find a male successor, young Kahu is developing a mysterious relationship with whales, particularly the ancient bull whale whose legendary rider was their ancestor.

A small Maori village faces a crisis when the heir to the leadership of the Ngati Konohi dies at birth and is survived only by his twin sister, Pai. Although disregarded by her grandfather and shunned by the village people, twelve-year-old Pai remains certain of her calling and trains herself in the ways and customs of her people. With remarkable grace, Pai finds the strength to challenge her family and embraces a thousand years of tradition in order...