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From the liner notes

Late one night on a country road, Tun and Jane accidentally run down a mysterious pedestrian. Fleeing the scene, they return to their lives in Bangkok, but soon discover that life has returned to anything but normal. Nightmares haunt Jane's dreams while Tun, a photographer, notices odd spectral figures begin to appear in his work. Returning to investigate the site of the accident, they can find neither the rumor nor report of the victim. But when one by one, Tun's closest friends begin to die, he and Jane know they must unravel this mystery before it unravels their very lives.