A group of soldiers are haunted by a mysterious supernatural force while training on a secluded island in this tale of terror set in 1983. According to legend, an insane woman died on the island at exactly 23:59. Now, every night at that time, her spirit returns to torment the living. These days the military uses the island for training. When frightened recruit Tan reveals that the woman's ghost has been appearing before him nightly, his fellow soldier Jeremy laughs in his face. Later, when the soldiers discover Tan's mangled corpse during a march into the forest, Jeremy vows to solve the mystery of the murderous ghost, and unearths a dark secret from the island's distant past.