Set along the ‘Bridge of No Return’ in Panmunjom, the demilitarized zone between North and South Korea. One day, a border guard is killed by a rifle bullet; the suspected marksman is a South Korean soldier (Lee Byung-Hun), who is found wounded in the middle of no-man’s-land. This incident will have grave repercussions. Both North and South Korea regard the incident as an act of deliberate provocation. The North accuses the South of having committed a ‘terrorist attack’, while South Korea suspects the North of having attempted an ‘abduction’. Both sides appeal to the authorities of the neutral states (NNSC )for help and ask them to investigate the affair. A female Swiss army captain (Lee Yeong-Ae) of Korean descent is then sent to Panmunjom to investigate the death of the North Korean border guard.