AD155: Under threat of exile from their hill-fort home of Carman, Tara and Kai, with their faithful dog Bran, flee in the night and go in search of their father Mabon, a Caledonian chief, gone to war against the Roman legions occupying the Antonine Wall, the final frontier of the Roman Empire. The journey is fraught with danger. The trio become separated and take different paths into Roman territory. Mysterious encounters, the help of strangers, and the ruthlessness of the enemy come together in a struggle for survival in a hostile world. Kai's fortitude, Bran's doggedness, and Tara's unflinching belief in the water goddess Sul, whose Stone she wears, might be all there is between freedom and captivity, life and death. This fast-moving adventure story is suitable for older children, teenagers . and adults.