Episode 24, "The Silver Curtain" marks the fourth and last appearance of Eric Pohlmann as Inspector Goron of the Surete (fifth overall, including "The Second Mona Lisa"). Also back for the second straight episode is Germanic villain Anton Diffring as Davos, shifty as ever, luring an unlucky gambler, Jerry Winton (Arthur Hill), to the address of Dr. Edouard Hebert (John Chandos), on a promise of money for a little shady business. Colonel March has spent several days in Deauville observing Davos as he consistently wins at the roulette wheel, but refuses to divulge any secrets. Winton follows Davos as they arrive separately at the doctor's home, an entrance in front of a beautiful fountain, when suddenly, a scream rings out, and Davos lies dead at the front door, a knife in his back. Winton discovers a wallet in the victim's hand, with both the doctor and his visiting patient, Eleanor Rood (Christine Pollon), claiming to know nothing about the deceased. Inspector Goron has no choice but to arrest Winton, who continues to protest his innocence, especially after March denies having seen him in the casino. The 'Silver Curtain' refers to the fountain itself, one of the more noticeable props on the show, which means it should figure in the denouement. Diffring is excellent, though dispatched all too soon, while Canadian actor Arthur Hill, a future Tony Award-winning Broadway performer, was making his television debut some five years after beginning his movie career. As always, Eric Pohlmann is a delight, matching Karloff step for step in their witty byplay (this is the sixth and last time that Ewan Roberts as Inspector Ames does not appear).