Bad Blood is a 1981 British-New Zealand thriller film set during World War II in the small town of Koiterangi (now Kowhitirangi) on the west coast of the South Island of New Zealand, and is based on the factual manhunt for mass-murderer Stanley Graham. The film was directed by English director Mike Newell, who went on to direct Four Weddings and a Funeral. Much of the film was shot at the original locations. The script was based upon Manhunt: The Story of Stanley Graham, by H. A. Willis (Whitcoulls, 1979) and adapted by New Zealand-born Andrew Brown.