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In this whodunit based on a novel by Agatha Christie, Hercule Poirot (David Suchet) is delighted to be entertaining a lovely Belgian film star one evening, while Chief Inspector Japp (Philip Jackson) is hot on the trail of a master jewel thief. When the actress confesses she's been receiving threatening letters since she came into possession of a valuable diamond called "The Western Star," Poirot and Japp join forces to find the offending party, though they also have to keep a close eye on the actress, who intends to wear her prize diamond for a major social event. oirot: The Adventure Of The Western Star was produced by the British network Granada Television, and later aired in the United States as part of the PBS series Mystery!.