Duncan MacDonald, a 19th-century Royal Canadian Mountie, has to escort a group of Cree Indians back to their above-the-border reservation. His guide in this endeavor is the not-too-trustworthy half-breed Natayo.

Inspired by events in A.D. 60, Boudica follows the eponymous Celtic warrior who rules the Iceni people alongside her husband Prasutagus. When he dies at the hands of Roman soldiers, Boudica’s kingdom is left without a male heir and the Romans seize her land and property. Driven to the edge of madness and determined to avenge her husband’s death, Boudica rallies the various tribes from the region and wages an epic war against the mighty Roman empire.