I saw a theatrical screening of this last year - always a treat with live TV productions, because the seams show so amusingly. But well worth seeing on the small screen, too. Bergman's first dramatic TV appearance, and she gives one of her best performances. Her incredibly expressive face and body language make the suspense and mystery really palpable. Supporting cast good, although not quite in the same category. Production is simple (only a couple of sets) but effectively atmospheric. Frankenheimer really knew how to make these shows work.