Twelve year old Evie's life takes a dramatic turn when she encounters a magical black stallion, Dag Dia, and is spirited away to the mystica land of Albion. Here, Evie's dreams of adventure come true when she meets and befriends Eriu, a young warrior intent on freeing her people, the Danann, from a life of imprisonment in Albion's underworld. With Dag Dia at her side, Evie bravely joins the Danann in their quest to overthrow the suppressive Milesians; a desperate last attempt to reclaim their rightful reign above ground. But with the adventure also comes great responsibility. Evie has a much closer connection to Albion than she realises, and during this extraordinary journey discovers that she, alone, is the key to saving an entire race of people and restoring the kingdom of Albion to glory.