During the Mexican–American War, US Army second lieutenant Captain John Boyd Guy Pearce pretends to be dead as his unit is crushed by Mexican troops, a ruse that lands him on a cart of American corpses headed toward the Mexican headquarters. As the convoy moves, blood from the surrounding bodies drips into his mouth, a grim reprieve that gives him the strength to seize control of the destination and help capture the headquarters. His display of “bravery” earns him a promotion to captain, but the higher command, General Slauson, views his earlier supposed cowardice with doubt and ships him away to Fort Spencer, a remote outpost perched in the Sierra Nevada, as punishment.
At Fort Spencer, a seven‑man garrison holds the line under the austere command of Colonel Hart, a grizzled veteran who fends off isolation and rustling fears with quiet discipline. The quiet is shattered when a stranger named Colqhoun Robert Carlyle arrives after his wagon train loses its way in the mountains, guided by a colonel named Ives who has misrepresented his experience. The newcomers soon reveal the harsh realities of survival: the fort’s horses and pack animals are eaten, and the men are forced toward cannibalism to endure the winter ordeal. Colqhoun flees from Ives’ insatiable appetite, a sign that something far darker may be at work.
A rescue party is organized to search for the missing travelers, and the fort’s Indian scout, George, warns that some legends carry dangerous truths: the Wendigo myth—that consuming human flesh transfers strength but curses the eater with an unending hunger. The party discovers evidence in a cave that sheltered Colqhoun’s group: bones, clothing, and a chilling realization that Colqhoun is, in fact, Ives, who killed and ate five companions. The revelation fractures the rescued explorers; Colqhoun/Ives picks off the rescuers one by one, leaving Boyd as the lone survivor.
Boyd’s escape after a desperate jump from a cliff leaves him with a broken leg and a haunting hunger. He hides near Reich’s body, gnawing on Reich’s flesh to stay alive, while Colqhoun methodically slaughters the rest of the party. When Boyd staggers back to Fort Spencer, he is delirious and torn by cravings, and the other soldiers doubt his story about a cannibal at the cave. A second expedition to the cave turns up nothing—no bodies, no sign of Colqhoun—so the fort tries to carry on with uneasy normalcy.
A temporary commander arrives at the fort and, unsettlingly, proves to be Colqhoun, presenting himself as “Colonel Ives.” The troops refuse to believe that Ives could be the killer, particularly since he bears no wounds from the earlier confrontation. That evening, Ives confides in Boyd that his tuberculosis once plagued him, until a Wendigo‑tale-inspired decision changed him: he killed and ate the fort’s Indian scout, which cured his illness and granted him renewed vitality. Now, he intends to use Fort Spencer as a base of operations to cannibalize passing travelers moving west—pulling Boyd into his orbit just as he grapples with his own cannibal cravings.
Suspicion falls on Boyd after a private soldier dies under mysterious circumstances, and he is imprisoned as the mystery deepens. The real killer—Colonel Hart, whom everyone believed dead—then murders Major Knox, escalating fear and paranoia. Ives reveals that he once saved Hart by feeding him his own fallen comrades, and Hart has become addicted to flesh as well. In a brutal test of will, Ives wounds Boyd and forces him to choose: gorge on human flesh again or die. Boyd capitulates, consuming a stew made from human meat, a grim restoration of his wounded body.
Yet Boyd refuses to join Ives and Hart in their grisly plan to coerce General Slauson into accepting their cannibalistic crusade. He convinces Hart to free him so he can put an end to Ives. Hart, hollow and weary of his own hunger, agrees, but life and loyalty blur as Boyd and Ives exchange brutal blows that leave them both dangerously near death because of their regenerative powers. In the end, Boyd traps Ives in a bear‑trap set in an outhouse, pinning them together as Ives dies first. Boyd, unwilling to survive by feasting on Ives, dies on top of his adversary, choosing dignity over survival.
Martha, George’s sister, discovers the two corpses and quietly closes the door, moving away as the fort’s fate hangs in the balance. General Slauson finally arrives on the scene, while his aide surveys the ruined fort and samples the lingering, eerie stew on the fire—an ominous reminder of what began at Fort Spencer and what remains unresolved as the men’s stories end in haunting stillness.
