The Crossing of Ingo (Ingo Series #4)

The crossing of Ingo is an ancient and dangerous coming-of-age ritual: a journey to the bottom of the world. Sapphy and Conor have been called to take part, the first of human blood ever to make an attempt. But Ervys and his followers are determined to stop them: dead or alive. Helen Dunmore builds her classic, much-loved series up to a breathtaking finale.