A former psychiatric patient seeks vengeance and aims to take down a gang of underworld criminals after a tragic accident sees his beloved family killed.

Near a coastal village of Thailand, a local fisherman rescues a stranger, who does not speak a word, offers him his friendship and names him Thongchai. When the fisherman suddenly disappears at sea, Thongchai slowly begins to take over his friend's life—his house, his job and his marriage.

Inexperienced Thai soldiers battle a growing undead menace in this gruesome survival horror. A Japanese military experiment that turns men into monsters escapes containment, it’s up to these troops to save their nation from annihilation.