In Chile in 1901, three horseman are paid to protect a vast estate. Accompanying a British soldier and an American mercenary is a mixed-race sniper, who realizes that his true mission is to kill the indigenous population.

Based on the novel by Antonio Di Benedetto written in 1956, on Don Diego de Zama, a Spanish officer of the seventeenth century settled in Asunción, who awaits his transfer to Buenos Aires.