Andrew Lau directs this visually arresting action thriller. Investigator Sam (Leon Lai) and his prosecutor fiancée, Ann (Asaka Seto), travel to Paris to celebrate their latest win in a case, but Ann is assassinated there by the group she prosecuted. Crushed, Sam retires to a secluded life and eventually meets You (Seto again), who's a dead ringer for Ann. As it turns out, You is Ann's killer. …