In the wild expanses of the American Southwest, two bounty hunters with contrasting personalities cross paths. Monco is a laconic sharpshooter with an eye for detail and a talent for tracking down his prey, while Colonel Douglas Mortimer is a former soldier turned bounty hunter, sophisticated and methodical in his approach. Though both are after the same profession, their methods and motivations differ. They become aware of a lucrative bounty on the head of a ruthless bandit named El Indio, a notorious criminal responsible for a string of bank robberies and murders. El Indio is cunning and psychotic, with a loyal gang to do his bidding, making him a challenging target for any lone bounty hunter.

Recognizing that El Indio and his crew pose a formidable challenge, Monco and Mortimer form an uneasy alliance to outwit the bandit. They devise a cunning plan to infiltrate El Indio's gang and set in motion a series of events aimed at capturing the outlaw and claiming the substantial reward. Their pursuit reveals a more personal dimension to Mortimer’s interest in bringing El Indio to justice, as the mission is not solely about the bounty. As the duo works together, their uneasy partnership is tested by their differing codes of honor, the machinations of the cunning El Indio, and the shifting allegiances within the outlaw's gang.