(Season 2, Episode 8; Airdate: 11/04/71)
When a staggering old man collapses in the street, Heyes, Curry, and two other men carry him to the Undertaker’s office where they discover he is actually suffering from exhaustion from carrying around a huge amount of gold dust. When a doctor is brought in, he informs the old miner he is near death, prompting him to give all the men the map to his gold mine. Once there, someone can’t be trusted, and Heyes makes an amazing observation — essentially discovering the concept of a lie detector. Guest-starring such notables as Rory Calhoun, Paul Fix, Joe Flynn, and Jack Kelly.