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.

In 1893, Segundo, a Chilean mestizo; MacLennan, an English army captain; and Bill, an American mercenary; embark on an expedition on horseback to delimit and reclaim the lands that the State has granted to José Menéndez. What appears to be an administrative expedition turns into a violent hunt for Onas, the natives of the Tierra del Fuego archipelago.