50,000 years ago, three young friends band together for a perilous journey to find a new home after plague devastates their coastal tribe. Accompanied by a blind horse and armed with meager weapons and their own elusive courage, Hamr, Timov and Duru defy savage odds to survive in the strange and brutal realm of Ice Age Europe. This incredible quest takes them through primeval forests stalked by cave lions and across vast glacial moraines of thundering woolly rhinoceros—to the Thundertree clan. These forest people accept Duru, the girl, for her magical powers. But the two young men must prove themselves worthy by hunting down a giant Neanderthal—the last of his line—who has been terrorizing the tribe.