A pair of Germans visiting a remote Greek island are slaughtered by someone who emerges from the ocean.
Five travelers are preparing to tour the islands, and Julie joins them. Julie asks for a ride to an island where some of her friends live, a detour that only one traveler, Carol, objects to—the Tarocco Piemontese tarot cards warned her that something bad would happen if they went. The group sails toward the island anyway. When they begin to disembark, Maggie, who is pregnant, injures her ankle and stays behind on the boat with its owner. A man attacks the ship, rips the sailor’s head off, and abducts Maggie.
The rest explore the island’s town, which is in disarray and mostly abandoned, save for a shadowy woman in black who writes “Go Away” on a dusty window. They uncover a rotting corpse that looks as if it was cannibalized, a discovery that sends them rushing back to the boat, now adrift. With limited options, they head to Julie’s friends’ house, where they meet the family’s blind daughter, Henriette. After wounding Daniel in a panic, Henriette calms down and rants about a madman who smells of blood prowling the island.
Andy and Arnold set out to find antibiotics to prevent Daniel’s wound from getting infected, while Carol confronts Daniel’s flirtations with Julie and goes into hysterics, fleeing into the night. Julie follows Carol but loses her and eventually reconnects with Andy and Arnold. The disfigured killer bursts into the house and rips out Daniel’s throat, but he spares Henriette and escapes as the others return. The next morning, the group treks through the island and discovers a mansion belonging to Klaus Wortmann. Julie recalls rumors that Klaus, his wife, and their child were shipwrecked and presumed dead, a tragedy that drove Klaus’s sister, Ruth Wortmann, to the brink. Ruth, the woman in black seen earlier, watches the group enter the mansion, comforts the sleeping Carol, and then hangs herself.
After Carol awakens, Andy and Arnold glimpse the boat drifting toward shore and hurry to secure it. Julie finds a partially destroyed journal in the mansion that reveals the killer is Klaus and that the bodies of all his victims lie in a hidden room. Arnold splits up with Andy, and Arnold finds an abandoned church where he encounters Maggie, and is confronted by Klaus. Klaus’s flashback reveals a shipwreck ordeal in which he stabbed his wife during a desperate attempt to survive, cannibalized their son and later ate his wife’s remains, an act that drives him to unhinged violence. Klaus regains his composure, stabs Arnold, and then strangles Maggie to death. As Arnold dies, he watches Klaus rip out and eat Maggie’s unborn child.
Julie uncovers the chamber where Klaus’s victims lie and leafs through another diary. Carol stumbles in and is killed with a throat slit. Klaus then attacks Julie, who locks herself and Henriette in the attic. Klaus breaks through the ceiling and kills Henriette, and is knocked off the roof by Julie before he falls into a well. When Julie peers down, Klaus attacks again, but Andy arrives and stabs Klaus in the stomach with a pickaxe, causing Klaus’s intestines to spill out. In his final act, Klaus gnaws on his own innards, then dies as Julie and Andy stand over him in stunned silence.
