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SPL: Sha Po Lang (released in the United States as Kill Zone) is a 2005 Hong Kong action film written and directed by Wilson Yip, and starring Donnie Yen, Sammo Hung and Simon Yam. The film was released in Hong Kong on 18 November 2005. It was followed by SPL 2 in 2015, and Paradox, released in 2017. The title Sha Po Lang refers to three words derived from Chinese astrology that each represent a different star capable of good or evil depending on their position in the heavens.
Chan, an articulate senior detective nearing the end of his career, is taking care of the daughter of a witness killed by ruthless crime lord Po. Martial arts expert Ma is set to take over as head of the crime unit, replacing Chan who wants an early retirement.
While undercover officer Kit is taken prisoner by the syndicate, he befriends his keeper and discovers an organ trafficking ring.
When a Hong Kong police negotiator is informed about the sudden disappearance of his 16-year-old daughter in Thailand, he travels there to search for her whereabouts.