 An assailant leaps Tarzan-style from a tree, murdering a wealthy rancher riding a horse. The victim s brother flies cross-country to hire Peter Gunn to disprove the Texas coroner s verdict of accidental death. The Henry Mancini score playfully emphasizes the big city PI sticks out like a gun in a haystack compared to the suspiciously lackadaisical local sheriff, but Gunn rounds up a Texas-size line-up of prime suspects, who might turn and stampede him.