Legend has it that in the abandoned medieval town of Berzano, at the border between Spain and Portugal, the Knights Templar (a fictionalized version of the real-life order that was dissolved in the 14th century following charges of witchcraft and heresy) leave their tombs at night and come back from the dead as revenants. The reanimated corpses are blind, because their eyes were pecked out by birds while their hanged bodies rotted on the gallows.
While on vacation nearby with her friend Roger Whelan, Virginia White reconnects with her dear college friend Betty "Bet" Turner, who relocated in the area and now runs a mannequin factory. Roger immediately takes a liking to Betty and invites her along for a train journey, provoking Virginia's jealousy, as the two women had a romantic relationship years prior. Angry at both, Virginia jumps off the train. Wandering through the country, she comes upon the ruins of Berzano, where she decides to camp overnight. The knights rise from their tombs and attack her, ultimately biting and ripping her flesh. Her corpse is found in a field the following morning by the returning train conductor.
The next morning, Betty and Roger retrace Virginia's steps, trying to find out what happened to her. They hear about the legend from some locals and meet two police investigators who inform them about Virginia's horrible fate. Later at the morgue, next to Betty's laboratory, Virginia's corpse comes back to life and kills a custodian, then flees to the lab and is only stopped by Betty's assistant, who manages to set Virginia on fire inside the mannequin factory.
In the meantime, Betty and Roger are investigating the legend with the help of Professor Pedro Candal, who indirectly send them to find his son Pedro, who lives near Berzano as a small-time smuggler and is suspected by the police to be the one who killed Virginia as a way to instill fear in the locals. Once they've located Pedro and convinced him to help them prove the knights are real, Betty and Roger return with Pedro and his lover Nina to Berzano, to confront the knights once and for all.
Upon their arrival, they are confronted by the knights, who kill Roger, Pedro and Nina. The knights find Betty through her heartbeat, and she flees from Berzano with the knights in pursuit. She boards a passing train, hiding in a cargo of coal. The knights take charge of the train, killing the conductor and cannibalizing passengers on board. The train arrives at the station shortly thereafter, and Betty, speechless, is helped by a station attendant. As several passengers go to board the train, they scream in horror at the sight inside.
