In the summer of 1863, Jose and Felipe Espinosa became Colorado's first serial killers by murdering 32 innocent white men. It is rumored that Felipe had a vision from Mother Mary, telling him to murder 100 gringos for each of the 6 family members lost in the 1847 Spanish-American war. Him and his brother carry out this mission until the commander at Fort Garland asks known frontiersman Tom Tobin to track them down and bring them, dead or alive.