Book IV of Earth's Children. Ayla the orphan and Jondalar the traveller leave the safety of the lands of the mammoth hunters and embark on a seemingly impossible journey across the whole of a continent to the Cro-Magnon settlement from which Jondalar set out years before as a young man. Accompanied by the half-tame Wolf, the stallion Racer and the mare Whinney, they brave enemies, the elements and the unforgiving terrain in their search for the place they call home.