American novelist Sian Anderson travels to the solitude of Greek island Monemvasia from her Los Angeles home to write her newest mystery book.

Terrified, she phones her boyfriend, John, back in Los Angeles, and asks him to report the crime, as she does not know the emergency number in Greece.

Kesner, an American marine captain stranded on the island due to the weather, offers to go help Sian, who has locked herself in the house.

Sian discovers Kesner stabbed to death in an upstairs bedroom, along with the corpses of Elias and his wife stuffed inside a closet.

Cornered and helpless, Sian recalls that Elias had mentioned several locked closets in the home, which he used to store his son's hunting weapons, and had requested she leave them unbothered.

At dawn, Sian finds a way out of the caverns, and ends up on a rock wall along the coast, where she sees a young honeymooning couple driving down the road.

Phil eventually corners Sian and attempts to strike her with the sickle, but a gust of wind forces him to lose his footing, and he falls to his death.