A King's Ransom - S8.E21

Clay Grainger is kidnapped and held for ransom by a gang hired by an Englishman (Patrick Macnee)who has posed as a friend of the Graingers. However, his true intentions are later revealed by his wife (Jackie DeShannon) but not before the Virginian follows the kidnappers - after the ransom drop-off - captures them, and convinces them to tell him where Grainger is stashed.