Blood flies when a high-tech modern soldier meets a stone-age barbarian. Most of it belongs to other people

US Army Sergeant Andrea Ferrero expects a boring few weeks on a cross-time jaunt, watching scientists catalog dinosaurs in what will one day be Montana's famous Hell Creek Formation. When the expedition stumbles onto a lost deep-time colony, however, Andrea's job turns deadly.

Kidnapped by stone-age nomads, Andrea finds herself stripped of her technological advantages and forced to prove her worth in a war against the implacable armies of the Slaver Empire. Worse, the Slavers have captured her time machine and the mission's one surviving scientist, and are using his futuristic weapons to their own ends. Andrea's only hope for survival and return home is her kidnapper, the tribal war-leader Trals Scarback. Ferociously intelligent and violently insane, this barbarian fights Slavers from atop triceratops-back, armed with his sky-metal sword, his blowgun, and his trained velociraptor. When he falls in love with Andrea, things get weird.