Young Redstart is discovering what a dangerous world he inhabits. Old Crow has told him tales of fearsome creatures like Sparrowhawk, Stoat and the deadly Pine Marten who once hunted through the trees like a dark shadow. Yet there is one danger he cannot escape. A danger he must face with family and friends afresh each year or perish when the freezing white death descends upon the land. Is he ready to undertake the great adventure of migration?