After his brother was crippled in the ring by a cheating Thai boxer, Chan Hung goes to Thailand to avenge his brother, and finds the key to an omen which may release their family from an ancient curse. He is then caught up in a spiraling web of fate, Buddhist curses, and black magic.
While possessed by an evil spirit, a man murders his daughter. A police detective investigating the case also becomes possessed. A good monk helps fight the evil spirit.
Constantly mistreated by her cruel husband, the frail Chan Sau-ying awaits certain death from tuberculosis. The new servant girl, Yi-wah takes pity on her mistress' plight and the pair proceed to drown him one evening. They dump his body in a near-by pond but Sau-ying believes that the man's bloated corpse has risen from the bog to seek vengeance.
